Hey, I'm on day two of the cambridge waight loss program. sole sorce as well.
I think with this diet you do need to be carefull. It is hard work, I think a lot of the work is mental though.
For those that don't know, sole sorce is step one and on this stage all you drink is their products and loads of water. Each one of there products contain 1/3 of your daily reconmended allowance of everything. Unless you are male or tall you have to drink 4 of them.
It is a vlcd, step one is I think if I remmeber right somewhere between 400 - 600 caleries a day depending if you are also having a small evning meal and cups of tea with milk like me.
I have read load about it, people have lost anywhere from 12 - 4lb in the first week.
my advice would be, only drink when your hungery. So get up and dressed etc and jus don't bother with it till you really want it. Then have the porrage or soup or what ever. Its hard when other people are eating, so keep a soup or something for then so you can eat with them. If that covers lunch time and tea time you have one other for supper.
Its not reconmended to do anything other than what you would normaly do on a plan this low. So don't start working out when eating so little. Faiting in a gym would be embarrising lol It really depends on what is normal for you, your adviser can help you with that. Also in the book it tells you on page 27 about exercise
Must drink the watter all though the day, don't drink loads at once. Remember water going in, comes out lol I was out shopping today and had to find the loo in every shop.
ps the caretaker, I love your profile picture, is that a wee pigmy headghog or a baby?