Noticed this started way back in 2016. I wonder how new member Hill Crest got on. If he still dips into the Forum, and the registration is original, it is a long way from home.
VHA 721 was the mark issued by the Smethwick/Bearwood local licencing area, before being later swallowed up by Birmingham. The old Midland Red buses were based in Bearwood, and all carried the HA registration.
Local BSA Dealer was C E Cope & Sons 481-487 Hagley Road Edgbaston. Good chance that's where it came from.
Swarfy