In several recent posts, I’ve described how the former sister brands Rolls Royce and Bentley increasingly use engines and components sourced via their current owners, BMW and Volkswagen respectively. But even when it was independent, Rolls wasn’t above a bit of engine-swapping itself, supplying a four-litre straight six to BMC for its top of the range Vanden Plas Princess in the 1960s. Pic taken - British Motor Museum Gaydon. (1/2)