Bit of an error in the film, the narrator states, the bike is fitted with a two stroke engine. The Velocette LE had, in 1948 Mk 1 form a side valve four stroke 150cc engine, was good for 50mph and about 90 mpg. Birmingham City Police had them and the most impressive feature was they were almost silent in operation,the bike, that is, not the Police! Produced from 1948 to 1970 when the Company went broke. John.