Thanks for all the suggestions guys! Are all the emulators suggested working ok? Its just I've had a few now which have been a bit poo to put it bluntly.
TV has bust now (typical - only got one other in the house and the ex won't give that up!) so I'm going to have to wait until next month now before having a proper look at emulation on the xbox. Can't wait. Think I'll book a few days off work and get a few beers in.