And to think there are proponents of Northolt being used to back up Heathrow with it non-existent RESAs, A40 dual carriageway at one end, petrol station at the other with fully laden Gulfstreams and Globals and even the odd BBJ popping in and out across the Atlantic full of fuel.
Remember that Spanish Learjet stopping the traffic on the A40 in the 1990s?
Funny how they get away with that as a military aerodrome, despite being completely dominated by civil aircraft use.
And as for obstacle clearances!