Thanks for your post, @dianthus101, it is kind of you to care. All of you 
I have made multiple approaches to my GP including phoning reception and emailing the practice manager and the CCG. The practice manager got reception to ring me to say he'd reply soon, but he never did; and the CCG never replied to me either.
Reception however assured me that I am 'on the list', but I mysteriously receive no communications from anyone about anything covid-related so clearly I can't be.
The vaccines have been a bloody farce. It's like I don't exist. DP (at the same GP practice) (different surnames) OTOH gets a lot of communication.
We have tried and tried to unpick it but it doesn't make sense.
Anyway, I'm glad to get the LFTs! As pp said, that must be down to the number of vaccinations I've had and the dates I had them. (All arranged without any help whatsoever from my GP practice.)
And some days I'm just too tired and unwell to be arsed with it all.