Cambridge diet!

Today is my first day starting the Cambridge diet!  I know it's a little drastic but I've been trying to shift this baby weight for over three years now and as the twins turn four this year i can hardly still be using them as a valid excuse for my ever expanding waist and hips. 
A mummy friend of mine started exactly a year ago and lost three stone in three months and has managed to keep it off so i decided to take the plunge.  It is rather expensive, at 40 pounds a week (sorry my keyboard wont let me use the pound sign?), but i never spend anything on myself so i figured i was worth it plus the prospect of being a size 10 again by the end of August is worth every penny. 
The shakes are surprisingly appetising however the same cannot be said for the soups - I've just tried to force down a spicy tomato concoction but to be honest I'd rather eat feet so I've settled for a chocolate shake instead.  The theory is to consume no more than 615 calories a day for at least two weeks.  This includes three shakes a day plus a 200 cal meal consisting mainly of a little bit of protein and two tablespoons of veg/salad. I realise it's not going to be easy, especially with my sweet tooth but I'm determined to succeed - wish me luck, i have a feeling I'm going to be needing it in bucket loads.