diff --git a/bcftbx/IlluminaData.py b/bcftbx/IlluminaData.py
index 4da087e..afcb9ce 100644
--- a/bcftbx/IlluminaData.py
+++ b/bcftbx/IlluminaData.py
@@ -1,5 +1,5 @@
 #     IlluminaData.py: module for handling data about Illumina sequencer runs
-#     Copyright (C) University of Manchester 2012-2022 Peter Briggs
+#     Copyright (C) University of Manchester 2012-2024 Peter Briggs
 #
 ########################################################################
 #
@@ -224,6 +224,26 @@ def cycles(self):
             return None
         return ncycles
 
+    @property
+    def complete(self):
+        """
+        Check if run is complete
+
+        Returns:
+          Boolean: True if run is complete (i.e. all appropriate
+            sentinel files are present), False if not (i.e.
+            some sentiel files are missing).
+        """
+        # Acquire run completion files
+        try:
+            files = platforms.RUN_COMPLETION_FILES[self.platform]
+        except KeyError:
+            # Fallback to default
+            files = platforms.RUN_COMPLETION_FILES['default']
+        # Check if all are present
+        return all([os.path.exists(os.path.join(self.run_dir,f))
+                    for f in files])
+
 class IlluminaRunInfo:
     """Class for examining Illumina RunInfo.xml file
 
diff --git a/bcftbx/mock.py b/bcftbx/mock.py
index da84884..93dd467 100644
--- a/bcftbx/mock.py
+++ b/bcftbx/mock.py
@@ -1,5 +1,5 @@
 #     mock.py: module providing mock Illumina data for testing
-#     Copyright (C) University of Manchester 2012-2022 Peter Briggs
+#     Copyright (C) University of Manchester 2012-2024 Peter Briggs
 #
 ########################################################################
 
@@ -42,6 +42,7 @@
 from .IlluminaData import IlluminaFastq
 from .IlluminaData import SampleSheet
 from .TabFile import TabFile
+from .platforms import get_run_completion_files
 from .utils import OrderedDictionary
 from .utils import mkdir
 
@@ -754,7 +755,7 @@ class MockIlluminaRun:
     def __init__(self,name,platform,top_dir=None,
                  ntiles=None,bases_mask=None,
                  sample_sheet_content=None,
-                 flowcell_mode=None):
+                 flowcell_mode=None,complete=True):
         """
         Create a new MockIlluminaRun instance
 
@@ -777,6 +778,9 @@ def __init__(self,name,platform,top_dir=None,
             be used to generate a sample sheet
           flowcell_mode (str): optionally specify the flow cell
             mode to be included in the run parameters
+          complete (bool): default is to include the appropriate
+            run completion files in the mock run; set to False to
+            omit these files
         """
         self._created = False
         self._name = name
@@ -785,6 +789,7 @@ def __init__(self,name,platform,top_dir=None,
         else:
             self._top_dir = os.getcwd()
         self._platform = platform
+        self._complete = bool(complete)
         # Set defaults for platform
         if self._platform == "miniseq":
             # MiniSeq
@@ -801,7 +806,7 @@ def __init__(self,name,platform,top_dir=None,
             self._include_sample_sheet = False
             self._flowcell_mode = None
             self._rta_version = "2.11.4.0"
-            self._completion_files = ("RTAComplete.txt",)
+            self._completion_files = get_run_completion_files("miniseq")
         elif self._platform == "miseq":
             # MISeq
             self._nlanes = 1
@@ -817,7 +822,7 @@ def __init__(self,name,platform,top_dir=None,
             self._include_sample_sheet = True
             self._flowcell_mode = None
             self._rta_version = "2.11.4.0"
-            self._completion_files = ("RTAComplete.txt",)
+            self._completion_files = get_run_completion_files("miseq")
         elif self._platform == "hiseq":
             # HISeq
             self._nlanes = 8
@@ -833,7 +838,7 @@ def __init__(self,name,platform,top_dir=None,
             self._include_sample_sheet = True
             self._flowcell_mode = None
             self._rta_version = "2.11.4.0"
-            self._completion_files = None
+            self._completion_files = get_run_completion_files("hiseq")
         elif self._platform == "nextseq":
             # NextSeq
             self._nlanes = 4
@@ -849,8 +854,7 @@ def __init__(self,name,platform,top_dir=None,
             self._include_sample_sheet = False
             self._flowcell_mode = None
             self._rta_version = "2.11.4.0"
-            self._completion_files = ("CopyComplete.txt",
-                                      "RTAComplete.txt",)
+            self._completion_files = get_run_completion_files("nextseq")
         elif self._platform == "novaseq":
             # NovaSeq
             self._nlanes = 2
@@ -866,9 +870,7 @@ def __init__(self,name,platform,top_dir=None,
             self._include_sample_sheet = False
             self._flowcell_mode = 'SP'
             self._rta_version = "v3.4.4"
-            self._completion_files = ("CopyComplete.txt",
-                                      "RTAComplete.txt",
-                                      "SequenceComplete.txt")
+            self._completion_files = get_run_completion_files("novaseq6000")
         else:
             raise Exception("Unrecognised platform: %s" %
                             self._platform)
@@ -1059,7 +1061,7 @@ def create(self):
             io.open(self._path('Data','Intensities','BaseCalls','config.xml'),
                     'wb+').close()
         # Run completion files (e.g. 'RTAComplete.txt' etc)
-        if self._completion_files:
+        if self._complete and self._completion_files:
             for f in self._completion_files:
                 io.open(self._path(f),'wb+').close()
 
diff --git a/bcftbx/platforms.py b/bcftbx/platforms.py
index a3fe863..c03159c 100644
--- a/bcftbx/platforms.py
+++ b/bcftbx/platforms.py
@@ -31,6 +31,20 @@
 PLATFORMS['illumina'] = "Unknown/Illumina"
 PLATFORMS['other'] = "Unknown/external"
 
+# Expected run completion files for different platforms
+RUN_COMPLETION_FILES = {
+    'default': ("RTAComplete.txt",),
+    'solid4': tuple(),
+    'solid5500': tuple(),
+    'hiseq4000': ("RTAComplete.txt",
+                  "SequencingComplete.txt"),
+    'nextseq': ("CopyComplete.txt",
+                "RTAComplete.txt",),
+    'novaseq6000': ("CopyComplete.txt",
+                    "RTAComplete.txt",
+                    "SequenceComplete.txt"),
+}
+
 # Dictionary matching sequencing platforms to regexp patterns
 # for specific instruments
 SEQUENCERS = {
@@ -50,6 +64,26 @@ def list_platforms():
     """
     return [x for x in PLATFORMS]
 
+def get_run_completion_files(platform):
+    """
+    Return a list of files indication run completion
+
+    Given a platform name, return a list of the files
+    that are used to indicate when the run is complete.
+
+    Arguments:
+      platform (str): name of the sequencing platform
+        (e.g. 'novaseq6000')
+
+    Returns:
+      Tuple: list of run completion files for the
+        specified platform.
+    """
+    try:
+        return RUN_COMPLETION_FILES[platform]
+    except KeyError:
+        return RUN_COMPLETION_FILES['default']
+
 def get_sequencer_platform(sequencer_name):
     """Attempt to determine platform from sequencer name
 
diff --git a/bcftbx/test/test_IlluminaData.py b/bcftbx/test/test_IlluminaData.py
index 85a8155..9f5faaa 100644
--- a/bcftbx/test/test_IlluminaData.py
+++ b/bcftbx/test/test_IlluminaData.py
@@ -72,6 +72,7 @@ def test_illuminarun_miseq(self):
         self.assertEqual(run.bcl_extension,".bcl")
         self.assertEqual(run.lanes,[1,])
         self.assertEqual(run.cycles,218)
+        self.assertEqual(run.complete,True)
 
     def test_illuminarun_hiseq(self):
         """
@@ -114,6 +115,7 @@ def test_illuminarun_hiseq(self):
         self.assertEqual(run.bcl_extension,".bcl.gz")
         self.assertEqual(run.lanes,[1,2,3,4,5,6,7,8])
         self.assertEqual(run.cycles,218)
+        self.assertEqual(run.complete,True)
 
     def test_illuminarun_nextseq(self):
         """
@@ -153,12 +155,13 @@ def test_illuminarun_nextseq(self):
         self.assertEqual(run.bcl_extension,".bcl.bgzf")
         self.assertEqual(run.lanes,[1,2,3,4])
         self.assertEqual(run.cycles,158)
+        self.assertEqual(run.complete,True)
 
     def test_illuminarun_novaseq(self):
         """
         IlluminaRun: test for NovaSeq run
         """
-        # Make a mock run directory for NextSeq format
+        # Make a mock run directory for NovaSeq format
         self.mock_illumina_run = MockIlluminaRun(
             '221125_A500968_0038_ABCDE1XX',
             'novaseq',
@@ -194,6 +197,7 @@ def test_illuminarun_novaseq(self):
         self.assertEqual(run.bcl_extension,".bcl.bgzf")
         self.assertEqual(run.lanes,[1,2])
         self.assertEqual(run.cycles,158)
+        self.assertEqual(run.complete,True)
 
     def test_illuminarun_unknown_illumina_platform(self):
         """
@@ -236,6 +240,7 @@ def test_illuminarun_unknown_illumina_platform(self):
         self.assertEqual(run.bcl_extension,".bcl")
         self.assertEqual(run.lanes,[1,])
         self.assertEqual(run.cycles,218)
+        self.assertEqual(run.complete,True)
 
     def test_illuminarun_unknown_illumina_platform_generic_name(self):
         """
@@ -281,6 +286,7 @@ def test_illuminarun_unknown_illumina_platform_generic_name(self):
         self.assertEqual(run.bcl_extension,".bcl")
         self.assertEqual(run.lanes,[1,])
         self.assertEqual(run.cycles,218)
+        self.assertEqual(run.complete,True)
 
     def test_illuminarun_miseq_specify_platform(self):
         """
@@ -323,6 +329,24 @@ def test_illuminarun_miseq_specify_platform(self):
         self.assertEqual(run.bcl_extension,".bcl")
         self.assertEqual(run.lanes,[1,])
         self.assertEqual(run.cycles,218)
+        self.assertEqual(run.complete,True)
+
+    def test_illuminarun_incomplete(self):
+        """
+        IlluminaRun: test 'complete' property when completion files missing
+        """
+        # Make a mock run directory for NovaSeq format
+        self.mock_illumina_run = MockIlluminaRun(
+            '221125_A500968_0038_ABCDE1XX',
+            'novaseq',
+            complete=False,
+            top_dir=self.top_dir)
+        self.mock_illumina_run.create()
+        # Load into an IlluminaRun object
+        run = IlluminaRun(self.mock_illumina_run.dirn,
+                          platform="novaseq")
+        # Check that run is not complete
+        self.assertEqual(run.complete,False)
 
     def test_illuminarun_miseq_missing_directory(self):
         """