Despite me calling and leaving to messages on Friday A's vet didn't get either of them. So in answer to the questions I had asked, Yes he needs to stay on one of the antibiotics he was on and he will need that morning and night for about four weeks. He doesn't need the other antibiotic again unless his condition worsens. He needs to be seen by the vet every week to ensure he is improving (or at least not going backwards).
However, if he hasn't made visible progress at each appointment then he may be better off being put down. Unfortunately, that is still hanging over his head. He looks so much better though.
I bought some shortbread today. Girl Child took it upon herself to decorate the tree. I knew it was small but it is only just over a metre even with the star on top.