This car was actually registered on 3rd March 1959 as an "F.W.R."
It was registered by its owner, listed as "F.W.R. Ltd" which doesn't tell you much - not even their address!
Although there is a company named F.W.R. Ltd in existence today which sells motorcyles and spares and tyres for them, they are in London and have no connection with the company which made this car at all, having been established only 16 years ago.
So I'm sorry to say I can add nothing further, but at least now we have a name!
And Djetset's doorhandle ID must be worth a bunch of points!!