GeorgeAbleLoveHowIndia, quite right! Also as an ex-Booker inhabitant of the Neil Williams/Ray Hanna era, I too knows me Merlins! Dub on the correct sounds, and you've got CGI perfection here. Quite amazing.
Nearest I ever got, 'cos I was a fledgling pilot and just happened to be around that day, was to sit in the cockpit of Adrian Swire's MkIX at the end of the hardstanding by Bianchi's hangar at Booker, tail well and truly lashed down, and do some carefully briefed engine-running with the cowlings off, while one of his mechanics did some fine-tuning on the carb.
So near yet so far, but a fine abiding memory!