What is this red racer?

[UltimaCH]

Not on this forum usually, but saw this Aston Martin at a Swiss meeting last Saturday in Romanshorn. All I noticed was a 4 cyl engine.
Thanks

[UltimaCH]

Many thanks Chris for the information. Will take some time to read all about this exceptional car. Indeed, it has an Ulster Automobile Club badge which can be seen on the picture taken from the front. Have also a short video taken of the car starting. Great sound and the raw petrol smell from the exhaust nearly takes you on a high. I have to find a way of compressing the video as the 30 secs film is around 48Mb
Cheers
Daniel