Well, I’m back albeit only for a few minutes a day as I can only manage a limited time with a screen at the moment.
Thanks for all the good wishes, they are much appreciated.
Apart from headaches when using a screen, and some from older fluorescent lights I’m pretty much back in full working order.
And now a public information message:
When travelling on the London Underground, avoid being anywhere near large American ladies with even larger wheeled suitcases on staircases.