chostie,
Take no notice of the previous poster; all companies flex their work forces as the workload changes between companies. Servisair have some issues at SOME stations but not at all as indicated.
All the ground handling companies have their +'s and -'s.
Try the websites for:
Menzies Aviation
Swissport UK
Aviance
Servisair
BA
You could also try the LGW Job Centre as most companies use tghis as wellas other recruiting methods.
It will all depend when you want to join; most will be looking for staff come Jan/Feb for the S08 period.
Good luck,
GH