Thanks, guys, I really appreciate your information!
When Upper Heyford was still active, they invited local fliers for a tour, including the radar room, and they impressed us with the radar view of road traffic on the M40!
I was towing a glider back from Booker (Wycombe Air Park) once, with a Piper Supercub in a fresh wind, making a ground speed of about 30 knots, which apparently made it difficult to see on radar. Anyway, I did talk to them, and they kindly informed me that a couple of F111s were about to do a maneuver abeam, which was so interesting (sort of a Red Arrows flypast)
that I lost my concentration, and next thing, the glider on tow was also abeam!
Didn't know what to do, so did nothing, and the glider pilot sorted it out by opening his airbrakes. It took us well over an hour to get back to Edgehill!
Ah, those days are gone forever!