BBC are reporting that the app won't let users upload negative test results, but from the comments under this article on Twitter, the app won't let you upload positive or negative results if your test was done in an NHS lab (confirmed by a tweet by the 'NHS' app Twitter account. here )
Why was Johnson so annoyed when people pointed out it is Serco Track and Trace, not NHS Track and Trace?
This whole thing is a farce and I won't be downloading an app made by this bunch of incompetents.