I already have a genuine NOS ex-WD RAF B40 Avon Police fairing, complete with blue light and indicators etc. sat in my garage ready to fit.
All the RAF B40GRs had bright chrome fittings, with some extra bits done as well such as the front brake plate, wheel rims and exhaust system, as they were officially called 'Police Escort' motorcycles suitable for VIP work as well as patrol duties.
Only 135 of these BSA RAF B40GRs were produced between 1968 and 1970, so yes, they are very rare!