"All I have is the brief mention it gets in "The Yowling Two-Stroke".
Nick -- there were somewhere around 130 Pou's built in the UK. At the height of their fame (1936) there were estimated to be 500 under construction, but unfortunately that was the year they were banned, due to an unrecoverable dive tendency when nose-down resulting in several fatalities.
The Scott Squirrel engine was light & simple, & had quite a few Pou owners as fans. I have seen at least one report which claims they were underpowered in less than ideal conditions. The aircraft at Elvington is a modern example built to original plans, & using a Squirrel AS2 -- no doubt 'cos of the local connection. It's registered G-AFFI, but that's bogus as that was an unallocated mark.
Spent a couple of hours on the Net collecting pix & articles on the Scott-engined Pou's. Can send them over if you are interested. Best article was taken from Jeff Clews' 1974 book "The Scott Motorcycle". See
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Also have a list of Scott Squirrels on public display in UK (mainly attached to airframes, but at least in the Pou they are easily visible!
Colin