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.
The Vauxhall Victor 2000 driven by Jeff Randall was registered RXD 996F, while the Vauxhall Ventora seen chiefly in Department S was registered RXD 997F. Both cars came from Vauxhall Motors Ltd's publicity fleet and the Ventora actually appears in one or two episodes of R&H as well. More than one car was used as Jeff Randall's Victor during the filming of R&H - you can spot the differences by the colour of the interior - some scenes depict a black cabin, others a burgundy one. Fans wanting to track down the Victor may be saddened to note that it was last seen in a scrapyard in 1976.
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.
Marty Hopkirk drove a red Mini registered BAP 245B, which was passed on to his widow after his death. Like most young men, Marty was possessive of his car and forbade Jeffrey Randall from driving it, even after he departed this world, as Jeffrey Randall was a hard driver and often got his Victor into scrapes during the course of his investigations.