Originally Posted by
Akubra
Its been a few days and no questions asked. I will give a clue or two.
Only one was made and it saw 4 years service.
The engineer had a workbench with mounted vice for maintenance on the go.
It also had four 303 machine guns and an internal telephone system.
It also still holds a record today for its type.
Pemberton-Billing PB 31E?
More in hope than...........
Aviate1138