Britten-Norman BN-1
The CAA registration document can be seen here: http://www.caa.co.uk/docs/HistoricalMaterial/G-ALZE-2.pdf
and there’s a brief description on wikipedia at http://en.wikipedia.org/wiki/Britten-Norman_BN-1
A page from Flight magazine (available on line) at http://www.flightglobal.com/pdfarchive/view/1951/1951%20-%202407.html and http://www.flightglobal.com/pdfarchive/view/1963/1963%20-%200634.html which is a brief history of Britten-Norman aircraft (up to 1963) – the relevant passage being this one:
“As might be expected, the organization came into being as the result of two personalities, John Biitten and Desmond Norman, the son of Sir Nigel Norman who founded Airwork in 1930.
They met as premium apprentices at the de Havilland Technical School in 1947, and subsequently designed and built an experimental ultra-light aeroplane known as the BN-1F. This machine crashed on an early flight, when the petrol supply to the JAP engine faded out. It was rebuilt, flown for a while, and now hangs in a boat store”
…and this is what the BN-1 looks like today http://www.caa.co.uk/applicationmodules/ginfo/ginfo_photo.aspx?regmark=G-ALZE&imgname=G-ALZE001&imgtype=jpg