diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/Program.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/Program.cs
index 80bd0a4e3e..d0c15ed3b9 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/Program.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/Program.cs
@@ -21,6 +21,7 @@
 using TeachingRecordSystem.Api.Infrastructure.Security;
 using TeachingRecordSystem.Api.Validation;
 using TeachingRecordSystem.Core.Dqt;
+using TeachingRecordSystem.Core.Dqt.Models;
 using TeachingRecordSystem.Core.Infrastructure;
 using TeachingRecordSystem.Core.Services.Certificates;
 using TeachingRecordSystem.Core.Services.GetAnIdentityApi;
@@ -219,6 +220,7 @@ public static void Main(string[] args)
         services.AddMemoryCache();
         services.AddSingleton<AddTrnToSentryScopeResourceFilter>();
         services.AddTransient<TrnRequestHelper>();
+        services.AddSingleton<PreviousNameHelper>();
 
         builder.Services.AddOptions<EvidenceFilesOptions>()
             .Bind(builder.Configuration.GetSection("EvidenceFiles"))
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/FindPersonByLastNameAndDateOfBirth.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/FindPersonByLastNameAndDateOfBirth.cs
index b3dcf29886..f8b2920cfe 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/FindPersonByLastNameAndDateOfBirth.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/FindPersonByLastNameAndDateOfBirth.cs
@@ -22,10 +22,8 @@ public record FindPersonByLastNameAndDateOfBirthResultItem
     public required IReadOnlyCollection<NameInfo> PreviousNames { get; init; }
 }
 
-public class FindPersonByLastNameAndDateOfBirthHandler(ICrmQueryDispatcher crmQueryDispatcher, IConfiguration configuration)
+public class FindPersonByLastNameAndDateOfBirthHandler(ICrmQueryDispatcher crmQueryDispatcher, PreviousNameHelper previousNameHelper)
 {
-    private readonly TimeSpan _concurrentNameChangeWindow = TimeSpan.FromSeconds(configuration.GetValue("ConcurrentNameChangeWindowSeconds", 5));
-
     public async Task<FindPersonByLastNameAndDateOfBirthResult> Handle(FindPersonByLastNameAndDateOfBirthCommand command)
     {
         var contacts = await crmQueryDispatcher.ExecuteQuery(
@@ -53,7 +51,7 @@ public async Task<FindPersonByLastNameAndDateOfBirthResult> Handle(FindPersonByL
         var previousNames = (await crmQueryDispatcher.ExecuteQuery(new GetPreviousNamesByContactIdsQuery(contactsById.Keys)))
             .ToDictionary(
                 kvp => kvp.Key,
-                kvp => PreviousNameHelper.GetFullPreviousNames(kvp.Value, contactsById[kvp.Key], _concurrentNameChangeWindow));
+                kvp => previousNameHelper.GetFullPreviousNames(kvp.Value, contactsById[kvp.Key]));
 
         return new FindPersonByLastNameAndDateOfBirthResult(
             Total: contacts.Length,
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/FindPersonsByTrnAndDateOfBirth.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/FindPersonsByTrnAndDateOfBirth.cs
new file mode 100644
index 0000000000..701a475671
--- /dev/null
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/FindPersonsByTrnAndDateOfBirth.cs
@@ -0,0 +1,92 @@
+using System.Collections.Immutable;
+using Microsoft.Xrm.Sdk.Query;
+using TeachingRecordSystem.Api.V3.Core.SharedModels;
+using TeachingRecordSystem.Core.Dqt;
+using TeachingRecordSystem.Core.Dqt.Models;
+using TeachingRecordSystem.Core.Dqt.Queries;
+
+namespace TeachingRecordSystem.Api.V3.Core.Operations;
+
+public record FindPersonsByTrnAndDateOfBirthCommand(IEnumerable<(string Trn, DateOnly DateOfBirth)> Persons);
+
+public record FindPersonsByTrnAndDateOfBirthResult(int Total, IReadOnlyCollection<FindPersonsByTrnAndDateOfBirthResultItem> Items);
+
+public record FindPersonsByTrnAndDateOfBirthResultItem
+{
+    public required string Trn { get; init; }
+    public required DateOnly DateOfBirth { get; init; }
+    public required string FirstName { get; init; }
+    public required string MiddleName { get; init; }
+    public required string LastName { get; init; }
+    public required IReadOnlyCollection<SanctionInfo> Sanctions { get; init; }
+    public required IReadOnlyCollection<NameInfo> PreviousNames { get; init; }
+}
+
+public class FindPersonsByTrnAndDateOfBirthHandler(ICrmQueryDispatcher crmQueryDispatcher, PreviousNameHelper previousNameHelper)
+{
+    public async Task<FindPersonsByTrnAndDateOfBirthResult> Handle(FindPersonsByTrnAndDateOfBirthCommand command)
+    {
+        var contacts = await crmQueryDispatcher.ExecuteQuery(
+            new GetActiveContactsByTrnsQuery(
+                command.Persons.Select(p => p.Trn),
+                new ColumnSet(
+                    Contact.Fields.dfeta_TRN,
+                    Contact.Fields.BirthDate,
+                    Contact.Fields.FirstName,
+                    Contact.Fields.MiddleName,
+                    Contact.Fields.LastName,
+                    Contact.Fields.dfeta_StatedFirstName,
+                    Contact.Fields.dfeta_StatedMiddleName,
+                    Contact.Fields.dfeta_StatedLastName)));
+
+        // Remove any results where the request DOB doesn't match the contact's DOB
+        // (we can't easily do this in the query itself).
+        var matched = contacts
+            .Where(kvp => kvp.Value is not null)
+            .Where(kvp => command.Persons.Any(p => p.Trn == kvp.Key && p.DateOfBirth == kvp.Value!.BirthDate?.ToDateOnlyWithDqtBstFix(isLocalTime: false)))
+            .Select(kvp => kvp.Value!)
+            .ToArray();
+
+        var contactsById = matched.ToDictionary(c => c.Id, c => c);
+
+        var sanctions = await crmQueryDispatcher.ExecuteQuery(
+            new GetSanctionsByContactIdsQuery(
+                contactsById.Keys,
+                ActiveOnly: true,
+                new()));
+
+        var previousNames = (await crmQueryDispatcher.ExecuteQuery(new GetPreviousNamesByContactIdsQuery(contactsById.Keys)))
+            .ToDictionary(
+                kvp => kvp.Key,
+                kvp => previousNameHelper.GetFullPreviousNames(kvp.Value, contactsById[kvp.Key]));
+
+        return new FindPersonsByTrnAndDateOfBirthResult(
+            Total: matched.Length,
+            Items: matched.Select(r => new FindPersonsByTrnAndDateOfBirthResultItem()
+            {
+                Trn = r.dfeta_TRN,
+                DateOfBirth = r.BirthDate!.Value.ToDateOnlyWithDqtBstFix(isLocalTime: false),
+                FirstName = r.ResolveFirstName(),
+                MiddleName = r.ResolveMiddleName(),
+                LastName = r.ResolveLastName(),
+                Sanctions = sanctions[r.Id]
+                    .Where(s => Constants.ExposableSanctionCodes.Contains(s.SanctionCode))
+                    .Select(s => new SanctionInfo()
+                    {
+                        Code = s.SanctionCode,
+                        StartDate = s.Sanction.dfeta_StartDate?.ToDateOnlyWithDqtBstFix(isLocalTime: true)
+                    })
+                    .AsReadOnly(),
+                PreviousNames = previousNames[r.Id]
+                    .Select(name => new NameInfo()
+                    {
+                        FirstName = name.FirstName,
+                        MiddleName = name.MiddleName,
+                        LastName = name.LastName
+                    })
+                    .AsReadOnly()
+            })
+            .OrderBy(c => c.Trn)
+            .AsReadOnly());
+    }
+}
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/GetPerson.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/GetPerson.cs
index 04099f3387..e77c3deabc 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/GetPerson.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/Core/Operations/GetPerson.cs
@@ -161,12 +161,10 @@ public class GetPersonHandler(
     ICrmQueryDispatcher crmQueryDispatcher,
     ReferenceDataCache referenceDataCache,
     IDataverseAdapter dataverseAdapter,
-    IConfiguration configuration)
+    PreviousNameHelper previousNameHelper)
 {
     public async Task<GetPersonResult?> Handle(GetPersonCommand command)
     {
-        var concurrentNameChangeWindow = TimeSpan.FromSeconds(configuration.GetValue<int>("ConcurrentNameChangeWindowSeconds", 5));
-
         var contactDetail = await crmQueryDispatcher.ExecuteQuery(
             new GetActiveContactDetailByTrnQuery(
                 command.Trn,
@@ -330,7 +328,7 @@ async Task<SanctionResult[]> GetSanctions()
             GetSanctions() :
             null;
 
-        IEnumerable<NameInfo>? previousNames = PreviousNameHelper.GetFullPreviousNames(contactDetail.PreviousNames, contactDetail.Contact, concurrentNameChangeWindow)
+        IEnumerable<NameInfo>? previousNames = previousNameHelper.GetFullPreviousNames(contactDetail.PreviousNames, contactDetail.Contact)
             .Select(name => new NameInfo()
             {
                 FirstName = name.FirstName,
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240101/Responses/FindTeachersResponse.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240101/Responses/FindTeachersResponse.cs
index 50794297fd..f7b3cf5938 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240101/Responses/FindTeachersResponse.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240101/Responses/FindTeachersResponse.cs
@@ -4,7 +4,6 @@
 
 namespace TeachingRecordSystem.Api.V3.V20240101.Responses;
 
-[AutoMap(typeof(FindPersonByLastNameAndDateOfBirthResult))]
 public record FindTeachersResponse
 {
     public required int Total { get; init; }
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240606/Responses/FindPersonResponse.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240606/Responses/FindPersonResponse.cs
index 314c567ee5..0e0e53d2f3 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240606/Responses/FindPersonResponse.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240606/Responses/FindPersonResponse.cs
@@ -4,7 +4,6 @@
 
 namespace TeachingRecordSystem.Api.V3.V20240606.Responses;
 
-[AutoMap(typeof(FindPersonByLastNameAndDateOfBirthResult))]
 public record FindPersonResponse
 {
     public required int Total { get; init; }
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Controllers/PersonsController.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Controllers/PersonsController.cs
new file mode 100644
index 0000000000..5e91ca9930
--- /dev/null
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Controllers/PersonsController.cs
@@ -0,0 +1,56 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Swashbuckle.AspNetCore.Annotations;
+using TeachingRecordSystem.Api.Infrastructure.Security;
+using TeachingRecordSystem.Api.V3.Core.Operations;
+using TeachingRecordSystem.Api.V3.V20240814.Requests;
+using TeachingRecordSystem.Api.V3.V20240814.Responses;
+
+namespace TeachingRecordSystem.Api.V3.V20240814.Controllers;
+
+[Route("persons")]
+public class PersonsController(IMapper mapper) : ControllerBase
+{
+    [HttpPost("find")]
+    [SwaggerOperation(
+        OperationId = "FindPersons",
+        Summary = "Find persons",
+        Description = "Finds persons matching the specified criteria.")]
+    [ProducesResponseType(typeof(FindPersonsResponse), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status400BadRequest)]
+    [Authorize(Policy = AuthorizationPolicies.GetPerson)]
+    public async Task<IActionResult> FindTeachers(
+        [FromBody] FindPersonsRequest request,
+        [FromServices] FindPersonsByTrnAndDateOfBirthHandler handler)
+    {
+        var command = new FindPersonsByTrnAndDateOfBirthCommand(request.Persons.Select(p => (p.Trn, p.DateOfBirth)));
+        var result = await handler.Handle(command);
+        var response = mapper.Map<FindPersonsResponse>(result);
+        return Ok(response);
+    }
+
+    [HttpGet("")]
+    [SwaggerOperation(
+        OperationId = "FindPerson",
+        Summary = "Find person",
+        Description = "Finds a person matching the specified criteria.")]
+    [ProducesResponseType(typeof(FindPersonResponse), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status400BadRequest)]
+    [Authorize(Policy = AuthorizationPolicies.GetPerson)]
+    public async Task<IActionResult> FindTeachers(
+        FindPersonRequest request,
+        [FromServices] FindPersonByLastNameAndDateOfBirthHandler handler)
+    {
+        var command = new FindPersonByLastNameAndDateOfBirthCommand(request.LastName!, request.DateOfBirth!.Value);
+        var result = await handler.Handle(command);
+
+        var response = new FindPersonResponse()
+        {
+            Total = result.Total,
+            Query = request,
+            Results = result.Items.Select(mapper.Map<FindPersonResponseResult>).AsReadOnly()
+        };
+
+        return Ok(response);
+    }
+}
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Requests/FindPersonRequest.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Requests/FindPersonRequest.cs
new file mode 100644
index 0000000000..52a2a5f921
--- /dev/null
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Requests/FindPersonRequest.cs
@@ -0,0 +1,18 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace TeachingRecordSystem.Api.V3.V20240814.Requests;
+
+public record FindPersonRequest
+{
+    [FromQuery(Name = "findBy")]
+    public FindPersonFindBy FindBy { get; init; }
+    [FromQuery(Name = "lastName")]
+    public string? LastName { get; init; }
+    [FromQuery(Name = "dateOfBirth")]
+    public DateOnly? DateOfBirth { get; init; }
+}
+
+public enum FindPersonFindBy
+{
+    LastNameAndDateOfBirth = 1
+}
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Requests/FindPersonsRequest.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Requests/FindPersonsRequest.cs
similarity index 82%
rename from TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Requests/FindPersonsRequest.cs
rename to TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Requests/FindPersonsRequest.cs
index cbc1940d8d..cf723103dc 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Requests/FindPersonsRequest.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Requests/FindPersonsRequest.cs
@@ -1,4 +1,4 @@
-namespace TeachingRecordSystem.Api.V3.VNext.Requests;
+namespace TeachingRecordSystem.Api.V3.V20240814.Requests;
 
 public record FindPersonsRequest
 {
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Responses/FindPersonResponse.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Responses/FindPersonResponse.cs
new file mode 100644
index 0000000000..ee1c272fed
--- /dev/null
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Responses/FindPersonResponse.cs
@@ -0,0 +1,24 @@
+using TeachingRecordSystem.Api.V3.Core.Operations;
+using TeachingRecordSystem.Api.V3.V20240101.ApiModels;
+using TeachingRecordSystem.Api.V3.V20240814.Requests;
+
+namespace TeachingRecordSystem.Api.V3.V20240814.Responses;
+
+public record FindPersonResponse
+{
+    public required int Total { get; init; }
+    public required FindPersonRequest Query { get; init; }
+    public required IReadOnlyCollection<FindPersonResponseResult> Results { get; init; }
+}
+
+[AutoMap(typeof(FindPersonByLastNameAndDateOfBirthResultItem))]
+public record FindPersonResponseResult
+{
+    public required string Trn { get; init; }
+    public required DateOnly DateOfBirth { get; init; }
+    public required string FirstName { get; init; }
+    public required string MiddleName { get; init; }
+    public required string LastName { get; init; }
+    public required IReadOnlyCollection<SanctionInfo> Sanctions { get; init; }
+    public required IReadOnlyCollection<NameInfo> PreviousNames { get; init; }
+}
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Responses/FindPersonsResponse.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Responses/FindPersonsResponse.cs
similarity index 66%
rename from TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Responses/FindPersonsResponse.cs
rename to TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Responses/FindPersonsResponse.cs
index 397256252a..8a614f26cb 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Responses/FindPersonsResponse.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/V20240814/Responses/FindPersonsResponse.cs
@@ -1,13 +1,18 @@
+using AutoMapper.Configuration.Annotations;
+using TeachingRecordSystem.Api.V3.Core.Operations;
 using TeachingRecordSystem.Api.V3.V20240101.ApiModels;
 
-namespace TeachingRecordSystem.Api.V3.VNext.Responses;
+namespace TeachingRecordSystem.Api.V3.V20240814.Responses;
 
+[AutoMap(typeof(FindPersonsByTrnAndDateOfBirthResult))]
 public record FindPersonsResponse
 {
     public required int Total { get; init; }
+    [SourceMember(nameof(FindPersonsByTrnAndDateOfBirthResult.Items))]
     public required IReadOnlyCollection<FindPersonsResponseResult> Results { get; init; }
 }
 
+[AutoMap(typeof(FindPersonsByTrnAndDateOfBirthResultItem))]
 public record FindPersonsResponseResult
 {
     public required string Trn { get; init; }
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Controllers/PersonsController.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Controllers/PersonsController.cs
index 772ac9b409..144e53d0f3 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Controllers/PersonsController.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/V3/VNext/Controllers/PersonsController.cs
@@ -5,7 +5,6 @@
 using TeachingRecordSystem.Api.V3.Core.Operations;
 using TeachingRecordSystem.Api.V3.VNext.ApiModels;
 using TeachingRecordSystem.Api.V3.VNext.Requests;
-using TeachingRecordSystem.Api.V3.VNext.Responses;
 
 namespace TeachingRecordSystem.Api.V3.VNext.Controllers;
 
@@ -47,17 +46,4 @@ public async Task<IActionResult> GetQtls(
         var response = mapper.Map<QtlsInfo?>(result);
         return response is not null ? Ok(response) : NotFound();
     }
-
-    [HttpPost("find")]
-    [SwaggerOperation(
-        OperationId = "FindPersons",
-        Summary = "Find persons",
-        Description = "Finds persons matching the specified criteria.")]
-    [ProducesResponseType(typeof(FindPersonsResponse), StatusCodes.Status200OK)]
-    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status400BadRequest)]
-    [Authorize(Policy = AuthorizationPolicies.GetPerson)]
-    public Task<IActionResult> FindTeachers([FromBody] FindPersonsRequest request)
-    {
-        throw new NotImplementedException();
-    }
 }
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Api/VersionRegistry.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Api/VersionRegistry.cs
index 6d33d79592..1b109d544f 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Api/VersionRegistry.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Api/VersionRegistry.cs
@@ -14,6 +14,7 @@ public static class VersionRegistry
         V3MinorVersions.V20240412,
         V3MinorVersions.V20240416,
         V3MinorVersions.V20240606,
+        V3MinorVersions.V20240814,
         V3MinorVersions.VNext,
     ];
 
@@ -54,6 +55,7 @@ public static class V3MinorVersions
         public const string V20240412 = "20240412";
         public const string V20240416 = "20240416";
         public const string V20240606 = "20240606";
+        public const string V20240814 = "20240814";
         public const string VNext = VNextVersion;
     }
 }
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/Models/PreviousNameHelper.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/Models/PreviousNameHelper.cs
index 53b1c4813c..a658dc89cc 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/Models/PreviousNameHelper.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/Models/PreviousNameHelper.cs
@@ -1,13 +1,14 @@
-namespace TeachingRecordSystem.Core.Dqt.Models;
+using Microsoft.Extensions.Configuration;
 using FullName = (string FirstName, string MiddleName, string LastName);
 
-public static class PreviousNameHelper
+namespace TeachingRecordSystem.Core.Dqt.Models;
+
+public class PreviousNameHelper(IConfiguration configuration)
 {
-    public static FullName[] GetFullPreviousNames(
-        IEnumerable<dfeta_previousname> previousNames,
-        Contact contact,
-        TimeSpan concurrentNameChangeWindow)
+    public FullName[] GetFullPreviousNames(IEnumerable<dfeta_previousname> previousNames, Contact contact)
     {
+        var concurrentNameChangeWindow = TimeSpan.FromSeconds(configuration.GetValue("ConcurrentNameChangeWindowSeconds", 5));
+
         var result = new List<FullName>();
 
         var currentFirstName = contact.FirstName!;
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/Queries/GetActiveContactsByTrnsQuery.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/Queries/GetActiveContactsByTrnsQuery.cs
new file mode 100644
index 0000000000..7595dc218f
--- /dev/null
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/Queries/GetActiveContactsByTrnsQuery.cs
@@ -0,0 +1,6 @@
+using Microsoft.Xrm.Sdk.Query;
+
+namespace TeachingRecordSystem.Core.Dqt.Queries;
+
+public record GetActiveContactsByTrnsQuery(IEnumerable<string> Trns, ColumnSet ColumnSet) :
+    ICrmQuery<IDictionary<string, Contact?>>;
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/QueryHandlers/GetActiveContactsByTrnsHandler.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/QueryHandlers/GetActiveContactsByTrnsHandler.cs
new file mode 100644
index 0000000000..e04410de65
--- /dev/null
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Core/Dqt/QueryHandlers/GetActiveContactsByTrnsHandler.cs
@@ -0,0 +1,33 @@
+using AngleSharp.Common;
+using Microsoft.PowerPlatform.Dataverse.Client;
+using Microsoft.Xrm.Sdk.Query;
+using TeachingRecordSystem.Core.Dqt.Queries;
+
+namespace TeachingRecordSystem.Core.Dqt.QueryHandlers;
+
+public class GetActiveContactsByTrnsHandler :
+    ICrmQueryHandler<GetActiveContactsByTrnsQuery, IDictionary<string, Contact?>>
+{
+    public async Task<IDictionary<string, Contact?>> Execute(
+        GetActiveContactsByTrnsQuery query,
+        IOrganizationServiceAsync organizationService)
+    {
+        var queryExpression = new QueryExpression(Contact.EntityLogicalName)
+        {
+            ColumnSet = query.ColumnSet,
+            Criteria = new FilterExpression(LogicalOperator.And)
+            {
+                Conditions =
+                {
+                    new ConditionExpression(Contact.Fields.StateCode, ConditionOperator.Equal, (int)ContactState.Active),
+                    new ConditionExpression(Contact.Fields.dfeta_TRN, ConditionOperator.In, query.Trns.ToArray())
+                }
+            }
+        };
+
+        var response = await organizationService.RetrieveMultipleAsync(queryExpression);
+        var contacts = response.Entities.Select(e => e.ToEntity<Contact>()).ToDictionary(c => c.dfeta_TRN, c => c);
+
+        return query.Trns.ToDictionary(trn => trn, trn => contacts.GetValueOrDefault(trn));
+    }
+}
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.Core/ServiceCollectionExtensions.cs b/TeachingRecordSystem/src/TeachingRecordSystem.Core/ServiceCollectionExtensions.cs
index b9ad20dba0..a75288d5e3 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.Core/ServiceCollectionExtensions.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.Core/ServiceCollectionExtensions.cs
@@ -11,7 +11,8 @@ public static IServiceCollection AddTrsBaseServices(this IServiceCollection serv
     {
         return services
             .AddSingleton<IClock, Clock>()
-            .AddCrmQueries();
+            .AddCrmQueries()
+            .AddSingleton<PreviousNameHelper>();
     }
 
     public static IServiceCollection AddAccessYourTeachingQualificationsOptions(
diff --git a/TeachingRecordSystem/src/TeachingRecordSystem.SupportUi/Pages/Persons/PersonDetail/Index.cshtml.cs b/TeachingRecordSystem/src/TeachingRecordSystem.SupportUi/Pages/Persons/PersonDetail/Index.cshtml.cs
index e4bac5b0f5..ac761c37ca 100644
--- a/TeachingRecordSystem/src/TeachingRecordSystem.SupportUi/Pages/Persons/PersonDetail/Index.cshtml.cs
+++ b/TeachingRecordSystem/src/TeachingRecordSystem.SupportUi/Pages/Persons/PersonDetail/Index.cshtml.cs
@@ -8,10 +8,8 @@ namespace TeachingRecordSystem.SupportUi.Pages.Persons.PersonDetail;
 
 public class IndexModel(
     ICrmQueryDispatcher crmQueryDispatcher,
-    IConfiguration configuration) : PageModel
+    PreviousNameHelper previousNameHelper) : PageModel
 {
-    private readonly TimeSpan _concurrentNameChangeWindow = TimeSpan.FromSeconds(configuration.GetValue<int>("ConcurrentNameChangeWindowSeconds", 5));
-
     [FromRoute]
     public Guid PersonId { get; set; }
 
@@ -48,7 +46,7 @@ public async Task OnGet()
                     Contact.Fields.dfeta_ActiveSanctions)));
 
         var contact = contactDetail!.Contact;
-        var previousNames = PreviousNameHelper.GetFullPreviousNames(contactDetail.PreviousNames, contactDetail.Contact, _concurrentNameChangeWindow);
+        var previousNames = previousNameHelper.GetFullPreviousNames(contactDetail.PreviousNames, contactDetail.Contact);
 
         Person = new PersonInfo()
         {