Thanks everyone - you are supportive gang!
Bear - I think I'm on my second round. I did the initial stint of around 11 weeks then had a kind of break while on holiday - didn't go completely back to old habits but drank a lot and did eat chips once or twice, and some bread. And put on 8 lbs or so.
The problem is that as soon as I add any carbs again, I gain - it doesn't seem to matter what I do in relation to staying within VLC, if there's a potato then I gain - I appear to be majorly carb-sensitive. And I really don't want to be! I had exactly the same problem with doing the Harcombe diet, as soon as I step off phase 1 I gain.
And re: the GP, our practice has lost 4 GPs in the last 18 months so we are down to one and a locum AFAIK, so the options are very limited. 
I am going to keep trying but allow myself a leeway of going to 1000-1200 if I really need to, and see where that takes me. I'll give it a couple of weeks, but if it doesn't work I shall have to reconsider.
I'm not diabetic, or pre-diabetic so I should be able to have a small amount of pasta, rice or a potato sometimes.
I just want to be 'normal'. To be able to eat something and not have to agonise about it and then physically and emotionally pay for it with weeks of not having it again.