Yeah, it's becoming a barrister. What happens is, you do your degree, not necessarily law; then they might do a law conversion course. In any case, they then have to do something called the BVC, Bar Vocational Course, then they are 'called to the Bar' by an 'Inn'. A barrister must be a member of one of the Inns of Court, which traditionally educated and regulated barristers. There are four Inns of Court: The Honourable Society of Gray's Inn, The Honourable Society of Lincoln's Inn, The Honourable Society of the Middle Temple, and The Honourable Society of the Inner Temple. All are situated in central London, near the Royal Courts of Justice. They perform scholastic and social roles, and in all cases, provide financial aid to student barristers (subject to merit) through scholarships. It is the Inns that actually "call" the student to the Bar at a ceremony similar to a graduation. The first six months of this period is spent shadowing more senior practitioners, after which pupil barristers may begin to undertake some court work of their own. Following successful completion of this stage, most barristers then join a set of Chambers, a group of 'counsel' (this is another word for a barrister) who share the costs of premises and support staff whilst remaining individually self-employed.
Sorry for length explanation. This probably makes it sound quite straightforward but it is actually really hard to get into. Many people get so far and then they can't find a chambers to give them a pupillage, or even if they do, getting accepted into a set of chambers afterwards can be nigh on impossible. I don't think I am being controversial when I say that the Bar is mainly (though not entirely) peopled by white former public schoolboys.