Another BRS film - this time 1952.
 

http://www.youtube.com/watch?v=sDbJ_ZdJqQ0
(see 4:20 - what lever does he engage first - before the gearshift lever - or is the second lever the handbrake?)

Notice how they have to shout to each other . . .

http://www.youtube.com/watch?v=nfiG40KhUNw