Hi, I'm a solicitor and was looking into this a while ago too and posted a couple of times in jobs and education but had no replies. As it happens I got a great offer for a private practice job so am staying there for the time being.
I guess it depends on what you'd want to teach, what you've practiced in and whether you want to specialise or teach at more base level.
I had similar problems trying to find advice on the net but what was suggsted to me was to try and see if anyone at an LPC provider would meet for a chat or e.mail me some info.
Uni is difficult as most seem to have phd's and do a lot of research based work but it may be worth having a chat with a law dept at a local uni.
It seems very few places offer law as an option at GCSE or A level and I'd assume you'd have to do the relevant training such as a PGCE or similar.
If you want the info I found on teacher training etc... then feel free to msn or e.mail me on
[email protected].