Had a brief chat with the guy in the photo who built it from scratch, complete with supercharged Rolls Royce 3.7ltr engine. He said he just spent the weekend at Beaulieu and was heading home.
There's something not quite right though and I'm am going to do a bit of research into it.
He started it up and it sounded like an aeroplane, an awesome sound.
The "real" Dreadnought Bentley was a 4.5ltr supercharged Rolls Royce engine monster but which ever way you look at it, this is a hell of shed special
TL1663 was a 1931 Rolls Royce so that bit checks out