Four days in to my seven days on 12 mg and I feel better than I've felt in many weeks. I still have niggles but they seem to be receding a bit further every day, and if I may borrow an expression from a poster on one of the other threads - I was leaping around in the garden yesterday like a gazelle! Well, not exactly but I managed to do a couple of small jobs with no consequences.
Today I managed a short cycle on my bike down to the beach - the first in several weeks.
Three days to go till I drop down to 10mg for a further seven days and I'm cautiously optimistic.
I will update.
Thanks to everyone who advised on the previous thread.