Well - the results are in and my HbA1c has risen to 48.
I am just glad that I didn't do the trial until I was pretty confident that the way I was eating, two meals a day and no more than 10gm of carbs in the first meal, the rest in the evening, and eating at 12 hourly intervals, kept me pretty much at the top end of normal, and with no spikes.
Oddly my requirement for Thyroxine is reduced, I need to reduce it even further. My thyroid seems to be coming back from the dead.
Perhaps it is the fasting which is the problem, or perhaps it is the quality of the carbs - mostly from the shakes.
Previously I was eating fresh salad stuff almost every day.
Ah well - off to the shops tomorrow with my usual shopping list and back to eating at 12hourly intervals, with berries, yoghurt, eggs and cheese back on the menu.