There is a 20 minute video of OMAM contexts called 'In Context' made by the BBC, and narrated by Andy Kershaw, years ago. It also contain contextual material for TKAMB and An Inspector Calls too. You probably have one in the dept somewhere! The ICT techies should be able to let you have the correct scart lead to attach a video player to a whiteboard. It's not whizzy but you could stop and start it and ask kids to link the film to bits in the book.