The series was not a hit on its first transmission in Britain. It had no network slot and was moved to different times and days at will by the TV companies. Some regions had it competing against the BBC's highly successful Paul Temple (1969), and actually dropped R & H mid season due to the subsequent poor ratings.
The white car driven by Mike Pratt was a "Vauxhall Victor FD". This was more or less unique to the Randall and Hopkirk show, but is commonly mistaken for the "Vauxhall Ventora" used in the Department S show and had a similar but different registration. The Vauxhall Ventora has a six cylinder engine, therefore a different sound and has a slightly different grill and lights arrangement at both front and rear, compared to the Victor.