I picked this up last week, and although I haven't had a chance to read it yet, it looks pretty funny.
From the back cover of the book:
" Hogwash is the most famous school in the wizarding world and Barry Trotter is it's most famous pupil. It's been that way ever since J.G. Rollins' "Barry Trotter and the Philosopher's Scone" broke publishing records worldwide. So important has Barry become to the school's bottom line, that it has been agreed that he can stay at Hogwash for as long as he likes. Barry Trotter is 22. Groupie-laden and scholarship-free, life has been good for the perpetual student, but now disaster looms. The movie "Barry Trotter and the Inevitable Attempt to Cash-In" has gone into production, and the Marketing Dept. at Wagner Bros. is going into overdrive."