Helen, as long as you are carefully monitoring your BG levels then reducing your insulin isn't as big a problem as you think. I was on 40 units Levermir and approx 45 units of novarapid daily, which I have now reduced to zero. I took the decision to go the whole way in order to assess if my body was going into recovery and not masked by continuing medication, as I was concerned that I was just increasing my insulin levels in order to maintain my current levels. I am now on week 5 and have lost 16lbs and my BG after meals goes up to 8-9, so I haven't conquered it yet but I stll hope. I do now occassionally have 2 units of novarapid in the morning if my morning BG seems a little high, in order to keep it on track, but this is still a lot better than the 90 units I was on before.
I haven't run this past my doctor, and I know that may sound a little risky, but I am monitoring my BG before and after every meal so if I think I do need some insulin I am able to react and keep it safe. I am finding that it takes approx 3 hours for my BG to respond and return to 'normal' levels, and that is on a Low cal/carb diet, so what it would do if I had normal carbs I don't yet know. I may be asking my body to handle more than it can cope with in the short term, but I am hoping that long term benefits will out weigh it.
Stick with it and carefully monitor your situation and you will get there. I have yet to meet a dietician that would agree with this diet and they are medically trained, but constrained by NICE guidelines.
The point about the ND is that you do lose weight fast to shock your system into recovery, or at least that is my understanding, but even then this diet does not work for everybody, so I take the pragmnatic view that even if it doesn't totally work on the diabetes it is better for me to have lost the weight and potentially reduced my dependancy on higher medication levels.
Good luck