I was referring to the ongoing widening of the M1, M25 and proposed M4.
My point is all the expensive infrastructure work that has and will happen links together to provide easier access to LHR for a large part of the UK. Whether that is the north and Midlands via HS2/CRL or M1/M25. further north via short haul flights using the new runway. East and the London area via Crossrail or west via Crossrail and a (long proposed) M4 upgrade.
I do not see Gatwick blending in with these schemes as easily and have never seen the argument for either one or the other.