Operation Third Form, features a fresh-faced John Moulder-Brown (Deep End) in a sparkling performance as the schoolboy out to foil a pair of north London crooks, is a pacey boy's own adventure complete with a groovy 1960s soundtrack.

A group of young railway enthusiasts attempt to stop the closure of the local railway by trying to raise money to buy it and the steam engine "Matilda." They get help from a pair of men claiming to be enthusiasts but who turn out to be robbers who plan to hold up the mail train