The thing with the LTF tests, though, is that there is nothing stopping someone scanning a test QR code and registering a negative result on the NHS website, without actually taking the test. It's not like you have to upload a photo of the actual test strip to prove it.
So, if there is any push domestically to use a recent negative LTF test as a condition of entry to anywhere, it's not necessarily going to work very well, is it 