TAdan wrote:
I think that may be the airfield he is referring to, he mentions it being to the NW of London. Same location...Mossies were built there, that sounds like a good match to me.

Thanks for your help.

Leavesden Airfield is (was) about 3 miles NW of Watford, and work commenced on building the site in 1940.
A total of 1390 Mosquitos and 710 Halifax's were built on the site. After the war the factory was leased to DH and they used it for the development and manufacture of the early DH jet engines. Post war UK industry amalgamations say the site become Hawker Siddeley and then finally Rolls-Royce which built it's helicopter engines there until final closure in 1993.
The airfield was sold off, and a large part of it has now become a housing estate, but the old factory buildings and hangers have become Leavseden Studio's and have been used for filming of some recent Bond films, and as of this moment some stuff for the new Harry Potter film is being shot there.
In fact, my girl-friend lives almost within stones throwing distance from the boundary of the old airfield.