PS Kitty, I've just looked at your stats, I see you are quite tall too - I'm 6' 1", I had got down to 13 stone and that weight to most woman seems massive. But according to the BMI chart that is hovering between ok and overweight, but a lot of my close friends and family said that I had gone too far and I had begun to get boney. I am a great believer in screwing up the BMI chart and finding a size or weight that you personally are happy with, 140lbs seem quite low to me for your height (only my opinion - your consultant is obviously one of the best to talk to).
Best wishes x