Make it clear AWS guidance does not apply to One Login

The Working with AWS accounts guidance does not apply to the One Login directorate as it has its own AWS organisation, so update the guidance to make this clear.

Co-authored-by: huw <[email protected]>

source/manuals/working-with-aws-accounts.html.md.erb

@@ -6,7 +6,9 @@ review_in: 12 months
 
 # <%= current_page.data.title %>
 
-Most teams in GDS use [Amazon Web Services (AWS)](https://aws.amazon.com/) as their infrastructure provider. GDS teams manage their own AWS accounts, but users must first sign into a shared base AWS account called `gds-users`. They can then assume roles in their team's AWS account to perform administrative tasks using [AWS's cross-account access pattern](https://docs.aws.amazon.com/IAM/latest/UserGuide/tutorial_cross-account-with-roles.html).
+Most teams in GDS use [Amazon Web Services (AWS)](https://aws.amazon.com/) as their infrastructure provider. GDS teams in GOV.UK and DSP manage their own AWS accounts, but users must first sign into a shared base AWS account called `gds-users`. They can then assume roles in their team's AWS account to perform administrative tasks using [AWS's cross-account access pattern](https://docs.aws.amazon.com/IAM/latest/UserGuide/tutorial_cross-account-with-roles.html).
+
+Note GOV.UK One Login has its own AWS organisation separate from GDS / Cabinet Office accounts. That is managed by the program and separate guidance applies.
 
 ## Request AWS user access