As Daveforty said see
www.bsa-regal.co.uk.
The UK rights to the BSA name was acquired by the Canadian Aquilini family.
BSA Co. was sold and a US company (Bill Colquhuon's BSA Co.) used the name for Rotax-engined military bikes and Yamaha-based Bushman machines for developing nations.
In 1991, Andover Norton and BSA Co. merged to create BSA Group, which was taken over in 1994 to form BSA Regal.
They announced a new Gold SR using a Yamaha SR400 engine in a Gold Star styled chassis.