Some very crude analysis - if you take the 20% from contract and charter work off their turnover then scheduled flying is losing them quite a bit of money. No contract and charter work and that £17.8m gross profit becomes a £14.5m loss.
Surely you'd have to take off the operating costs of the contract and charter flying - this assumes you'd still be doing all of the flying and incurring the costs even with no revenue, which logically no-one would do? From a quick read, I don't think it's possible to come up with any meaningful analysis, which is probably exactly why the accounts are presented in the way they are!