You can bet it won't be Lgw or man as the number of people trying to get back/in is large.
Generally the more northern bases are the ones that will be requiring extra people, not because they are northern base but more to the fact that the pilots already there work so hard that they are running out of hours.
Expect to go onto the 737 as no direct pilots onto 78 and still people going onto the 756 but its a reducing fleet.
Hope that helps, if I've got it wrong I'm sure one of the other guys will correct.
Cheers