Homo,
I have never stated that Manchester should not offer whatever flights it wants to. It is however down to airlines to choose where to fly from/to not airports.
All I have said is that those in the north who live nowhere near Manchester, (which included myself for most of my life) should not be forced to have to use Man or AMS. LHR should also be encouraged to try and take the non UK connection traffic that will bring money into the UK.
If the income generated by an expanded LHR can pay back the taxpayer funded portion and then go on to return a healthy profit then it has a business case.
Manchester can do whatever it likes.