I had an NHS letter telling me to so used a mobile walk in centre that was just doing the boosters and only working on certain days. Turned out to be quick and easy. Seems this one seldom gets long queues. About 20min for both me and wife.
The google map marker. Well we have 3 retail centres close together with separate entrances in a one way system. Smallest in the middle which is where the marker was. Fortunately people had worn a path through the hedge.
Our GP phones a few weeks later for just my wife and not me. Can't tie names and addresses together.
There flu jab hasn't work well for some years, saves them contacting people so we have used a local chemist for 2 years now.