Namespaces Article Talk. He wanted to make his story even more feasible -- here's two unsuspecting innocent guys who you don't really know and look what can happen to them out there! It was good. For all the other parts, because he didn't know many British actors, he went to the theatre in London. That was right at the beginning of the movie. Then they'd say:
But as soon as we were attacked it was hang onto your seats folks, this is going to get pretty horrific.
Pretty quickly! The sets were at Twickenham Studios where they had the interior of the apartment as a set although some scenes were shot at the real flat too.