Thank you for the replies. I've asked a mathematician colleague to help me explain to the nurse how the low hba1c comes from a constant narrow range without spikes and high numbers, rather than too many lows. It's reassuring to hear from folk - thank you- especially when I'm increasingly loosing confidence in the DN ( who from the start told me to be more relaxed about it, not to test too often and not to start weighing food, that as I'm in a honeymoon phase "now is the time to eat fish and chips" and frequently complains that my numbers are "too perfect" and she wants to see more random high numbers). Advice and guidance gratefully received!