Miles M39 Libellula, a tandem wing experimental design for a fast bomber.
It did indeed contain at least one rivet, and was designed over the breakfast table by Ray Bournon and George Miles. Unfortunately, the rivet dude forgot whereabouts he placed said rivet so his name was struck from the 'whodunit' folder at Miles.
Miles, on the other hand, drove an all black Austin A40 and preferred marmalade on toast , while Ray had a rather sporty looking Riley 15/6 Adelphi Six Light saloon on a rather nice shade of pale blue. Ray liked a he-mans brekkie and would scoff down bacon and eggs, with large cuppa rosy !
Incidentaly, they drew the original design on back of some old tracing paper Ray found under the floorboards whilst redecorating and they used a HB pencil that was worn down to about an inch of pencil left (Cutbacks dontchya know !)
They original were going to call it a Liability as they werent sure it would work but George wasn't too hot on the spelling and so it ended up being a Libellula
And to help the pilot, they painted a great big letter 'P' near the front so he'd know where to get in !