It includes also the clutch lever assy LV7/BC/18-455 (BSA part number 18/455), and the exact same number for the front brake lever assy.
Basically it is the complete standardised handlebar controls as mentioned by O&M for the other motorcycle manufacturers as also shown in last edition O&M page 31 for Ariel W/NG.
No brand is mentioned but as already noted they may have been made by both Amal and Doherty.
Is there an illustrated BSA parts list for S7218? If so can somebody send me a copy of the relevant pages?