Thanks Tom for your reply.
As soon as the burn became apparent (a few weeks after the radiotherapy) I did telephone the specialist nurse on duty for advice. As so often happens it was a bank holiday so we were sent to a walk-in centre for the prescription. I was given 3 creams which were used over a period of months. No change, so I used Aqueous Cream as advised.
There was a period when it was infected, so then the GP prescribed an antibiotic cream, followed by the Aqueous cream!
I am sorry if I gave you the impression that I hadn't had the burn seen. It is that nobody seems to know what to do with it and I thought someone on the forum may have had a good experience with something similar.
Many thanks, and my best wishes, Jane x