(1974, Edward Woodward, Eric Porter)

Film adaptation of a successful TV series reworks the TV episode 'A Magnum for Schneider'.
Callan boards ex London Transport RT3200 (KYY929), which at the time was owned by Brakell of Cheam:

This glimpse of a DMS class Daimler Fleetline in the Strand in London is interesting for the white stripe, which would suggest it as from the range DMS118-367:
The pub seen here is the Royal Oak at Waltham St Lawrence, near Maidenhead, and this is the rear of an Alder Valley Bristol RELL/Eastern Coachworks: