I didn't think the Blackburn Billabong was THAT successful.
Herod,
Try the next letter of the alphabet!
Stationair,
The Canadian Tiger Moth was only ever known as the DH 82c. Canopy, gear legs further forward, heater (?), electric starter (?) and an unspung tailwheel. A member of my gliding club rebuilt one with open cockpits. I suppose you could call it a DH 82ca:
