Surely the problem is that nobody can operate UK domestic feed into LHR at a reasonable rate of return ?
Virgin Red failed A320 45% load factor
BA Leeds have failed A320 50% load factor
That leaves FlyBe , BMI, possibly Loganair using much smaller aircraft but still paying "triple 777 level" landing rates.
And those fees will go up with RW3 not down.
My understanding is that the FlyBe loads are less than spectacular and are only retained as FlyBe will be able to sell the slots on in 18 months.
If HAL have faith in connecting say Derry, Teeside, Carlisle, and Liverpool ( A route which incredibly could not even be sustained by KLM) maybe they should set up an airline themselves and operate the service ?