I was at the school that was used for some of the filming (I added the school name to the filming locations). They filmed during the term time so we saw the cast around campus. The headmasters garage being used (and exploded if I remember correctly?); the one side of the school converted to look like a French village street (and desperate attempts by students to get some souvenirs); a bedsit in the same corridor as mine being painted green for a scene (a nasty colour green as well but I don't remember which scene) and Ade Edmonson giving autographs on cigarette packets of students who were not allowed to smoke :) Happy days....
Review of Happy Families
