Most pollution in the area comes from the junction of the M4 and M25 where more vehicles (generally trucks and vans (diesel of course)) transit in 15 -30 minutes than entire aircraft movements in a day. Most ramp vehicles at LHR produce either no or very little pollution.
Plans for tolls will be advanced in action soon I suspect
E.R's actions are supported by the British Labour party, - They deserve each other - Drongos the lot of them