Chanced upon this little 20-minute gem this afternoon. It's the official Mobil film of the 1957 UK run (there are several films of the US runs on YouTube) which started and finished in Ascot, using Buxton for two overnight stops. Commentary by Raymond Baxter and it opens with some footage of a sports car race at Silverstone - I couldn't recognise it offhand, but no doubt the Le Mans start will enable somebody to pin it down fairly quickly.
Some nice in-car footage 'on the road' and a lovely sequence of a Land Rover going over Hard Knott Pass - again including in-car, right at the summit and going 'over the top'. There was quite a big foreign entry, so there are shots of some visiting metal not normally seen on British roads. Even a brief view of a Sheffield tram.
There are five further showings currently scheduled: 06.00 June 22nd, 13.35 June 23rd, 15.35 and 23.40 June 25th and 23.40 July 7th. There might be more in the future, but TP TV only issue their schedules three weeks in advance.