They're usually films currently out at the cinema, or just released on DVD. If you know the names of the actors/actresses involved, you should be able to find the movie on www.imdb.com easily enough
The film is Planet Terror - the second part of the Robert Rodriguez/Quentin Tarantino Grindhouse double-bill.
I'll talk to the art team about pic credits. We use the same films across sections of a particular issue - for example one film for Firsts Tests and/or News, another for a TV supertest etc.
Found details of that film now. I suppose it's a little challenge every month to try and work out all the films! Maybe have the film titles in the following month? For those stick, like me. Do you know how many results you get when typing in "Red Bikini, Guns, Beard" into Google!