Thirdly, the initial version of the app was built by an external team who were already engaged with DHSC. They had won a competitive tender (which was published) but, as I'm sure you can understand, there wasn't time to run a new one for the Contact Tracing app.
Fourthly, if you have evidence that the development of the app - which was done quickly, with all source code and design documents published as open source, and which saved lives (https://www.ox.ac.uk/news/2023-02-22-nhs-covid-19-app-saved-...) - was somehow corrupt, I'm sure we'd all like to see it.
Firstly, "Track and Trace" is what the Post Office do. Perhaps you're thinking of "Test and Trace"?
Secondly, the UK Government hasn't had app development skills in-house for a long time - see https://gds.blog.gov.uk/2013/03/12/were-not-appy-not-appy-at... - so there was little choice but to use an external provider.
Thirdly, the initial version of the app was built by an external team who were already engaged with DHSC. They had won a competitive tender (which was published) but, as I'm sure you can understand, there wasn't time to run a new one for the Contact Tracing app.
Fourthly, if you have evidence that the development of the app - which was done quickly, with all source code and design documents published as open source, and which saved lives (https://www.ox.ac.uk/news/2023-02-22-nhs-covid-19-app-saved-...) - was somehow corrupt, I'm sure we'd all like to see it.
Fifthly, if you're about to say "£37bn" - have a read of this https://fullfact.org/health/NHS-test-and-trace-app-37-billio...