I am no expert, however, as far as I know, you can embark on a postgraduate course if you'd like to specialize in an area of law or if it intrigues you in one way or another and you would like to learn more, or if you want to go into academia. Solicitors do the LPC, Barristers the BVC. Although some of them choose to do postgraduate course nonetheless, however, it is not compulsory.