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"Hot Andy" hot air engine - stock code 2757

Never seen one of these before, a hot air engine of apparently commercial manufacture, it's plated "Hot Andy, Adaptors (Engineering) Ltd, London". Does anybody know anything else about them?

Spirit-fired, with meths contained within the base extrusion. It's obviously had a lot of running, it still turns over freely although the crank needs some attention - it's a fabricated component which needs a bit of attention with Loctite.

Base 12 x 6 inches
Flywheel 3 inch diameter