Aye Ian,
Very sorry to read that the shingles is lingering and leaving you with neuralgia. I hope that it heals through time.
As for the GP appointment, the system is broke and it is very easy to get onto the hamster wheel of telephone receptionist, nurse, ad nauseum! My wife was caught in this cycle and it wasn't until we went and pointed out to the "Practise Manager" that their "safe system" had a "fail loop" in it, rather than a "fail safe loop" that we had any positive movement and managed to obtain a GP telephone consultation and explain the problem. So far things have improved, but whether the "system" has been modified, we have yet to test the system.
All the best for 2024, Bill