That's at Lakeside, of course...
A lovely car, its 'orphan' engine was always a question to me. But it certainly was better than a Mazda rotary!
I too dislike rotaries but I suspect the parts are a lot easier to find.
I do remember the car in period and even then thought the engine a little unusual.
I cannot remember its performance relevant to the other similar cars.
I suspect that the builder probably did a deal somewhere and got it for the right money, and then it was current so the parts less of an issue.