Well like I say, I think it will end up being a Boeing 767 service, especially since MyTravel or Airtours as they were then pulled their 767 service to SFB (which actually went via Glasgow Prestwick iirc) because of lack of pax, so I can't see XL filling a 744, no matter how much time has passed since MYT served the route.
I think we can handle a 744 though, although it would probably have to park 'nose out' because our tugs can't handle a jumbo (I think it was the same situation with Onur Air in the summer with their Airbus A300-600R's), but I'm sure I once did see a 747 of Air Atlanta years ago parked in the traditional 'nose in' way.