Hi Kelfie, I did LL Foundation last summer and I've still a stone to lose, so I'm starting LLL on 1st Feb for a 4-week module to finally shift it! So, from what I can gather LLL works on the basis of:
Daily
3 shakes or soups
or
2 shakes or soups plus 1 bar
PLUS
1 protien meal (say meat, fish etc) with loads of salad or veg (no carbs)
There is also a daily dairy allowance - milk for hot drinks or cheese
It's a LCD, apposed to a VLCD such as LL or CD, and around 800 cals per day. LLL works on 4-week modules with a closed group of up to 12 ladies or 12 men (same sex groups only) and they state the average weight loss during a 4-week module is around 1 stone. You have a weekly class for weigh-ins and chats, which I found really helpful during LL Foundation last year.
Your LLC will provide you with the food packs/bars, book, shaker etc when you join. No medical form is required to join, as it a LCD, and I believe it's something like £45 or £49pw (not too sure yet!).
Prior to your first class you are asked along to a group meeting session a few days before your first group meeting to meet the rest of your group, watch a dvd, talk from LLC, get weighed, measured, photo taken etc., which I think is a really good idea, espcially for those who haven't done LL in the past.
There is a criteria set out by LL to join LLL, which is you must have a bmi of between 25-29.9 (LLL is for those who want to lose between 1 and 2 stones), if your bmi is higher they will recommend doing LL Foundation to get your bmi down to under 29.9 to meet this requirement.
Hope this helps and it's all right!