Attended one at "Panico" based just off Charing Cross Road in '99, Money well spent. It was spread over six Sundays and covered every thing to do with Film production.
What made me choose this one was the fact that all instructors on the course are film pro's, Bob the guy that runs it was sound recordist on a number of Terry Gilliam's movies and his brother is a director who also edited "Brazil".
A lot of the other courses in London, such as NYFA are run by Film school graduates rather than people with actual production experience. A lot of the people that have attended panico courses have gone on to have jobs in the industry, because of the contacts that panico has, allowing people that have attended their courses to go on work experience ect.
It cost me just over