Although, I listened hard, and the Bentley didn't quite have the Merlin sound. Something to do with not actually being supercharged perhaps?
(I sound like I know what I'm talking about, but I just picked up the non supercharged bit from James May on the programme....)
I was at a steam fair/car show once, and a bunch of us were gathered round a big Cadillac with the bonnet up and engine running, when Something started up in the distance. Almost sounded like a Spitfire. Herdlike, we drifted away, to find two blokes with a Merlin on a trailer, well tethered to the ground, and running a little stumpy prop. What a sound! When they throttled back, we all ducked!
The Cadillac was left, ignored.