Nice challenge. Although I'm no longer a player, I visit you regularly. Being from Peterborough I should have recognised Sage's. Some time ago I found a book telling its aeronautical history, which I bought but now cannot find. I think it was "Plane to Plane" by Martyn Chorlton. After building Avro 504 and parts of Horsas they turned their hand to Aeroncas after the war. The factory was close to Westwood airfield, just across the railway lines from Sage's Lane.
Laurence