I'm on weekly immunosuppressant injections and have other health conditions and haven't received mine yet, need it as a back up for work, as I'm self isolating, and other things.
I've had it backed up medically, last spoke to a GP who said quite a few people haven't had one yet, they are being sent out via "codes" so taking a while and they (GP surgery) will also be following up with a letter to all the patients they deem vulnerable too.
So it may be, if eligible under the criteria, a letter just hasn't come through yet.