Great stuff, Allan. I love the jingoism of the Pathe coverage "Britain wins International Tourist Trophy" - 45 cars entered, only 2 overseas drivers (I count Baron d'Erlanger as British) although there were several foreign-built cars driven by British owners. Hardly a display of overwhelming British superiority!
Interestingly, some of the roads have hardly changed since then - the twisty section as the cars enter Dundonald is the same today. Plus the narrow streets of Comber past the famous butcher's shop.
The Great Man points out to the camera that he isn't comfortable in the SLR as he's too close to the 'wheel. Can you just imagine Alfred Neubauer's reaction if he'd heard that! It would never have happened of course - the mechanics would have done an all-nighter to get things just right for the driver. Neubauer took such things very seriously. It was one of the things that impressed Moss so much about the Mercedes organisation.
(PS I wonder why the Frazer Nash took so long to get away at the start? The drivers had to erect hoods, but that car was a fixed-head saloon and could have just driven off into the distance before the others got going. Maybe a starter problem?)
(PPS Your comment about Health & Safety is very apposite . The very reason the race ceased to exist is because of a car ploughing into spectators on the run down to Conway Square, oddly enough on a wide and straight section of the track. I've never understood how the car could have veered off-course at that point, but sadly there were fatalities.)