Paul Terry gurgled happily, sounding much like
they were saying:

Did it come as a great surprise to you, back then, that aircraft
movements would increase?

Yes.

gobsmacked

Why did they do that? Because the aircraft noise made _that_ house, in
a location of _that_ type, cheaper than it would have been if it
wasn't for the aircraft noise.

Houses in Richmond are among the most expensive in the country.

"among".

Exactly. Your claim that house prices under the flight path are cheaper
is not born out by the facts, except in the immediate vicinity of the
airport.

I notice you snipped the rest of that response. Shall we consider it
again?

Compare Richmond prices with an equivalent area, with equivalent
transport links and proximity to central London, but without the
aircraft noise.

Or, let's put it another way, what d'you think would happen to
Richmond house prices if the aircraft noise stopped tomorrow?