I'm a member of the Southampton Heritage group on Facebook, and we're trying to identify a three wheeler in an old photograph, standing alongside a mk1 Reliant Regal. The picture dates from the early fifties, and the car in question has a 1952 registration KCR556. I'll try to describe it.
Imagine an Isetta with a non opening front, two suicide side doors with quarterlights, two Isetta style headlamps above the two front wheel arches which contain what are almost certainly Ford Popular wheels. The roof is canvas. The rear of the car is a bit like a Messerschmitt, but longer and deeper, and there is a luggage rack on it. There's no clue as to the rear wheel layout, whether single or two side by side. On the front of the car, there is a shallow bonnet, rounded and hinged at the bottom, with a 5 horizontal bar grill, through which you can see some sort of mechanism. There is no front bumper. By virtue of the front Ford wheels, my guess is that the whole front axle assembly from a Popular has been used, perhaps even the engine as well. The car doesn't look home made.
I expect you're as baffled as I am! Help!!