Do they just want to get to London?
The majority will do, I think. I remember fleets of Scandinavian airliners flying into SEN in the 60s and early 70s - Braathens, Fred Olsen and others - they weren't doing anything other than going on to London to shop and sight see. I know that fifty years have passed, but when you live in a town of less than 100,000 people London is still a big attraction.