And you win another point! It is referred to in most sites as Bentley-Royce V12 Supercharged Special. It's not the first Bentley-Royce (Bentley chassis with RR engine) Burrell has built.
"Built by Rob Burrell as the ultimate Bentley special with an 8 litre, V12 Rolls-Royce Phantom III supercharged engine at its heart. The chassis is from a 1936 Derby Bentley and with the engine hailing from 1936 making this car highly eligible for VSCC, BDC and many other historic events."