I have been to see the consultant at the eye infirmary today. The op has worked and the retina is making very good progress. They don't need to see me for another six weeks. It's just a matter of time now and waiting to see what my vision is like as it slowly returns. That apparently can take as long as a few months, although I am pleasantly surprised at what I can already see above the gas bubble. Again, it's looking good.
I can slowly and carefully resume normal activity. The consultant was quite impressed when I said I used to walk five or more miles every day. There is also that huge pile of wood I had delivered shortly before Xmas that is waiting to be turned into baseboards.
All the good wishes and prayers I have had sent my way, many of them from here, seem to have done the trick.