Depends where you live in the UK of course, but there are some pretty cheap flights available if you fly to Eindhoven. I've managed to get a return flight on Ryanair for £44 only, from Manchester, excluding baggage etc. [happy]
Considering it will probably cost me more to actually get the train to Manchester in the first place, that's not a bad deal [haha]
I live near Portsmouth. I've just tried looking from Southampton Airport, and the cost for a return is nearly £1300?? Surely that cannot be right? I'm useless at travel stuff!