T&N
As Druk explains, no change to M4/M25, other than a tunnel for M25 where the gradient will be enhanced to cross the M4. Also the A4 is moved and the land it occupied "given to LHR" or are they to pay the actual sq metre/yard rate for this valuable piece of real estate?
The HS2 will compensate landowners, LHR have not offered to pay for road alterations en masse, too expensive.