Far from my books I can only rely on the net and on my index.
I think you are looking for BICAR.
The 1st pic cames from a 1929 article, and the vehicle is named Roe Car:
The 2nd pic cames from a 1931 magazine, no-name:
The 3rd pic comes from the Aviation museum in Southampton, where is displayed as AVRO Monocar 1926:
The 4th pic cames from the net, showing an AVRO Mobile from 1924
The 5th pic cames from the net, a website about motorcycles and it is called AVRO Monocar 1926
I found also a source that calls it BICAR, where the Monocar is a totally different model (a quite ordinary car). The same source shows pics #6 as AV first Monocar 1924, but I suspect this is the most reliable source.