Originally Posted by
DaveReidUK
Wrong.
"Heathrow offers the fastest, most cost effective and most practical route to delivering new hub capacity. Costs are estimated at £15.6bn, all of which would be privately funded.
Government support for surface access improvements would be required and is estimated at £1.2bn."
Heathrow Press Releases
It doesnt specifically say the M25 or M4 though, does it. And there is a reason for that.