I guess it was done by the same guy who painted your Yamaco
Coeno came over this week and had a look at it. Looks like this is a very original frame. Not quite sure how it is going to look but one thing is definitive: the rear brake. There are mounts there for a Lockheed master cylinder so that's going on the bike!
The only thing we're not sure about the is rear of the frame. It has mounts to accept the pointy airstream type seat, Spondon couldn't tell me if this was done by them.