Showing 1510 ro 1700 on Ch 82; 'Mr Denning drives north'.(1951/2)
Missed most of it but apparently it involves John Mills crashing a Miles Hawk (mock up).
Interior shots showed John Mills as an aircraft engineer in a factory which looked like it was producing Princes or Pembrokes together with what looked like a Leonides on a stand so possibly Luton?
Shot out of the window showed a lattice work control tower, very tall.
The plot involves Mills accidentally killing his daughter's boyfriend then hiding the body which goes missing, but that's not important.