Well done PJ - I've given you a point for that answer.
The engine was actually a Yamaha V8, made up of 2 Yamaha 4-cylinder motorcycle engines.
My question about who made it was actually seeking the car's designer and the prototype's maker; I don't know about the Light Car Company but the names I was looking for were already provided by Arunas, though I removed his reply since he was not (at that time) entitled to post it.
I will now give Arunas the point for naming the designer and builder as Peter Stevens (who designed the McLaren F1) and Chris Craft.
Well done all!