BIWI is a mumsnetter who is very experienced and well-read on low carbohydrate eating. she runs a low carb bootcamp approx. 3 times a year on here, which runs for 10 weeks and follows 10 simple rules, with two very strict weeks to start with. the current bootcamp is just coming to an end, but if you're interested in joining then there is always an ongoing chat thread between formal bootcamps, and you can start anytime you like - there are always people to support and advise you - the latest thread is here.
it's a good idea to read up on low carbing before you start, as a lot of the rules seem to go against the usual advice, so it's good to understand why you need to make particular food choices. BIWI has put together some info here: