Not so much a question but a bit of information.
I live in Southend-on-Sea and they are doing walk in boosters at the Civic Centre. You qualify if it’s 6 months from the second dose. They count to the day, I think there is a day or two leeway. Only know as I have had my booster shot last night. Might be worth looking at the NHS website and booking in I don’t think they are sending letters out just yet
Hope this helps