The prototype (1928) ?
used a reversed Alvis 12/75 engine and chassis, as the Alvis was a front wheel drive the steering had to be locked and a steering axle at the other end.
The designer Sir Charles Burney was also involved in the design of the ill fated R100.
Other engines used, at the Jam Factory Maidenhead, were 3Ltr Beverley straight 8, Armstrong Siddley 20hp six and a Lycoming straight 8.
Had around independent suspension
Patent was bought by Crossley in 1933
I also read the car was about 20 foot long with a top speed of 40mph.
More like a small Lorry than a car