I wonder whether MAG have a long-term plan to do EGNXZA from somewhere else? They're a fairly cost-concious outfit, after all.
Their 2 busiest units have contracts with NATS, but the 2 smaller ones are done 'in-house'. Allegedly, MAG are interested in recent events at EGBB, EGKK and EGPH, and, talking to one of their ops-managers last year indicated that they are also very interested in the potential of r-TWR technology.
I wouldn't be surprised to see all the ATC operations eventually transferred to a 'bunker' in Manchester Town Hall.