The heel & toeing mentioned by Jeremy Clarkson in his Aston Martin is the act of braking with your toes whilst using your heel or the side of your right foot to blip the accelerator to bring the engine revs up to match the selection of a lower gear.
Concerned viewers may like to know that Aston Martin gave Jeremy Clarkson permission to drill holes in the side windows of the DB4. Although that makes it no less amazing that he didn't cock it up.
Richard Hammond's braking issues stem from the XKSS's continuous flow Dunlop hydraulic braking system, which relies on a hydraulic pump powered from an underslung helical spur gear shaft running off a skew gear splined to the mainshaft. But you knew that already, obviously.
'Dogging' - a British term for taking part in, or watching others taking part in, 'adult' activity in a public place. The word is believed to come from the idea that the watchers would use walking their dog as a cover story.
Eagle-eyed viewers will notice that while driving through the foggy mountains in a loutish hot hatchback, James May is listening to some very un-loutish Johann Sebastian Bach on his car stereo.