NHS lateral flow self-tests aren't technically allowed for travel. One must purchase privately for such purposes. Recommended routine lateral flow testing in Scotland is supposed to end at the end of April, subject to political faff of course.
There's plenty of private providers of lateral flow tests, with varying costs, and of course there's online scams as well. When returning to Glasgow from a holiday in February I used a provider recommended by my travel agent, picked from a list of uk-government-approved providers. One test cost me 17 quid.

Team Albuquerque will be subject to the same requirement before heading home, so I am interested in whatever arrangements you end up making.

Kent

As Humphrey pointed out, the CDC guidance simply says a negative test is required so I'm thinking I'll just pack a quick test kit or two in my bag and take it before returning home.

Kent