Another one here saying don't do it....
Unless you are brilliant, you will probably not get a TC straight away and will have to work as a paralegal. If you do get a TC, expect to be beasted. (The first week of my TC involved working 60 hours straight without a break or sleep. This was not even in the City). If you want to earn decent money then you will need to go down the commercial route, as others have said. However, the partners will own you, and most won't make allowances for your family life. If you want to work PT, kiss goodbye to ever getting promoted.
My DH is a consultant in the NHS and we both hope that any DC's we have avoid law like the plague. His hours are much more convivial and family friendly than mine. It is actually depressing to find out how much lawyers in smaller firms earn.
The root of all of the problems mentioned on this thread is the massive oversupply of lawyers over the last 10 years or so. BPL, the CoLaw etc do not take into account the diminishing number of training contracts when considering how many places to offer, which is nuts imo. That is the main differentiator with other careers mentioned on here - the outlook for lawyers is pretty darn bleak.
(I went to Law School with a former hairdresser who had failed the GDL initially and then went on to fail the LPC twice. They just kept on taking her cash for re-sits even though it was bloody obvious that her chances of a training contract were about zero.)
That said, the PP who mentioned the GLS might be onto something. Whatever you do, do not let that final salary pension go!