A guy at work has just bought this Grinnal trike based on the Triumph Rocket 3 motorbike! 4 valve per cylinder, 2300cc, fuel injected, three cylinder in-line motor!
Sounds great, looks cool but all the disadvantages of a bike and a car to be honest!
Seen plenty of the Grinnall Scorpion III/IV around, but never seen/noticed one in that configuration before. Probably because it's not a unique style like their others.