I'm in the high risk group (due to current chemotherapy) but I've not received a letter. However I doubt that it wold tell me anything I don't know anyway.
I regard total isolation as impractical, so I'm simply trying to limit the number of times I leave my house and, of course, to observe the social distancing rules. I'm also deliberately only shopping where there are wide aisles (which rules out the Co-op down the road, which is very cramped) in order to make it easier to stay well away from other people. I'd rather do a 30-mile round trip to Waitrose (where I feel relatively safe) than shop locally in cramped conditions.
I had my latest chemo session at Ipswich Hospital this morning and then went straight to Waitrose (because it's on that side of the town anyway). My plan now is to remain indoors for at least two weeks and, ideally, for three (so that I can then leave my house just once, for chemo and shopping on the same day).
I know what the Government advice for people like me is and I know the (hopefully small) risks that I'm taking. I can't see how getting a letter would make any difference.