Tim (Robin Askwith) passes his test to become a driving instructor (by bonking his female examiner of course). He and Sid (Anthony Booth) open a driving school next door to a rival led by the rather deranged Truscott (Windsor Davis). Naturally most of the pupils appear to be sex starved women whom Tim has to instruct (in various ways!)
There isn't really much plot to this, its more a series of saucy sexcapades with gratuitous nudity, nonsensical comedy situations and crude innuendo. Its brilliant of course!
A very funny film and maybe the best in the series, its not high art for sure but has its own special kind of genius. Some very good comedy turns including by Irene Handl make this highly enjoyable if you are broad minded enough.