What you have to think of is some nights Thomsonfly are the only ones opperating, say 4 flights from 2200-0700. For those 4 planes theyve got atleast 3 controllers two of which have to have both approach and aerodrome, then you've got 1 assistant, CAT 6 fire cover, full handling agent staff through the night. All for 4 planes.
It doesn't take a genious to work out where money was being lost.