I don't think so; there are a couple of things that seem wrong to me for it to be a Scimitar :- The B-pillar seems much too small. AFAIR the Scimitars didn't have opening rear side windows and you can clearly see the catch on R/H one.
More than half the length and you're not far off It's also smaller and more foreign than a Scimitar...
Just for interest I found this "In the 1960s John Dodd of Kent, England put a Merlin engine (some say it actually was a Rover Meteor tank engine, but then this is a Merlin minus superchargers) in a car called "The Beast". Originally it had a grille from a Rolls Royce, but after complaints from them he had to change it. According to himself he once drove by a Porsche driver on the autobahn and this person then called Rolls Royce asking about their "new model". The Beast was once listed in the Guinness Book of Records as the world's most powerful road car. The engine came from a Boulton Paul Balliol training aircraft and gave 1262 bhp (941 kW) at 8500 feet (2,600 m). In the car the supercharger was removed so it "only" gave about 850 bhp (630 kW). The chassis was custom made with a fibreglass body and used a gearbox from a GM 400. The car was later restored by John Dodd's son Paul Dodd and he also has a 2050 bhp (1530 kW) twin-supercharged Rolls-Royce Griffon 37 litre engine from a late-model Spitfire he is willing to put in a car if somebody would be interested in buying it
