One wonders if EMA and / or FedEx at EMA have bitten off more than they can chew in taking on the extra business from FedEx. Even DHL appear to be struggling for resources, be that boots on the ground or ramp / cargo terminal space and in recent months have redirected ad hoc freighters (I'm thinking of F.1 work) that wound up at Doncaster.
If MAG don't invest in additional ramp space there is the distinct risk they could kill the goose that lays the golden egg - that is cargo business - as I feel sure that Doncaster would be more than happy to make disgruntled operators offers they'd find difficult to refuse, particularly Amazon, that has a pretty big logistics operation not far from Finningley.