The next major expansion in UK will probably be Heathrow.
The surrounding infastructure will be picked up as part of national infastructure spend, whilst there is a recommendation that even actual runway costs will be underwritten by the Government as this will ensure shareholder confidence.
I suspect those MPs who are against Heathrow have picked on this.
They may use air quality as an excuse but is there a reluctance not to ring fence investment in a national asset which will pull in many billions in corporation tax and dividends.
(I have excluded Manchester and indeed Stansted as they appear ti be fully funded by MAG) so are not part of the debate