Bottoms Up
(1960, Jimmy Edwards)
Spin off from the 'Whack-O' television series and following a similar formula with Edwards as the Professor trying to control unruly schoolboys.
The boys arrive in three coaches, two Leyland Tigers and a Bedford OB.
Only the lead vehicle can be definitely identified, it's AME454, a Leyland Tiger TS4 rebodied in 1946 by Thurgood for White Star of Kingston. Fleetname here is 'Chiselbury School', but there is a good chance that all three coaches were supplied by the same company:
(thanks Colin Read)