Unfortunately, the agency that runs the scheme won't allow me to visit my bed-bound mother without "evidence" of a clear test, despite the fact that the system only checks that a new test id is given, not whether you actually used the test, or what the result was (you're expected to be truthful on that form - you're not allowed to just be truthful when you enter the building).

Which completely defeats the point.

Luckily, nothing.