Another update.
I didn't go out walking yesterday because of a tender knee; previous experience says to rest it or a world of pain awaits. I am also skipping my (very enjoyable) fortnightly weekend group bike ride for the same reason.
Nevertheless my fasting BG this morning was 5.1 which is a big change from the start of the week.
Of course, as usual I have gone in full bore with the changes so I don't know if it is more exercise, less treats or no booze which has made the difference.
Anyway, looks like cutting back to very low carbohydrate may clean out any glucose stores. Intermittent fasting or just one water fast might do the same.
Then again working my leg muscles a lot more (they do look bigger) may have cut back my insulin resistance. Who knows?
I think my main target must be to reduce my waist measurement, perhaps to 34". I suspect that this will involve a degree of mental anguish as I deny myself nice things long term.