As a young spotter at Squires Gate, now Blackpool International Spaceport, in the early 1950s, I well remember a local motorbike racer buying 3 surplus Tiger Moths very cheaply for the relatively high octane fuel in the tanks. Motorists were still running on Pool petrol of a much lower octane. Apparently he did very well in local sprints and was kind enough to donate them to us for the bonfire on November 5th when the fuel ran out. Hindsight etc.