BSA C15 in Movies
Polizeifunk ruft EP: 2.7
These appear to be C15S Scramblers, with fitted alloy tanks. The C15T Trials model had a silencer as standard. There's a special lightweight trials machine, built by Bryan Hyatt of Gloucs. and with a less visible silencer, on the bsaotter.com website.
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It's a BSA but the model i don't know BSA A10 1960-63. Not sure which model It is a single, probably a C15.
I think nzc is correct. The front wheel and tank look more c.1965 C15 than B40.