The Small World of Sammy Lee (1963, Anthony Newley, Julia Foster et al)

Known for a strong performance by Newley and its depiction of 1960s Soho, but also has a brief scene at Victoria Coach Station, as Sammy (Newley) sees Patsy (Foster) off on a coach travelling north but fails to leave with her. Three coaches are seen, one a Royal Blue Bristol MW/Eastern Coachworks, the second a Midland Red C1 , the third West Yorkshire CUG12 (MWY618):
There's also this glimpse of two other coaches, plus an RT family bus at night: