Have a thing you didn’t know was a thing.
Anrmstrong-Siddeley Sapphire 236. Ferrari style numbering, so it was a 2.3 l six. They also did a 234 which was quite a lot more powerful, odd though it may seem.
Just 603 were made, many of which had what was called the Manumatic transmission which involved a centrifugal clutch which was also operated by vacuum when the driver moved the gearlever.