Firefly was a motorcycle frame-kit, made in Lowestoft, Suffolk, from 1965 to 1970.
The kit was a light and well-made trials frame originally made to take the BSA C15 engine. It was later adapted to take others. Production was limited and more or less made to order, as few people knew of its existence. Although knowledge of this imporved later, the arrival of the Bultaco and changes in taxation advantages for supplying kits ended the enterprise.