Constructed on a Rover P4 (75) chassis, the Marauder 2 litre Sports was built in 1950-52 by ex-Rover men Gordon Mackie and Peter Wilks.
It was not a great success, and you see 13% of the production in this one photo.
I know a special-builder who bought the last set of Marauder body panels to cloth a Sunbeam-Talbot 90 chassis which he powered with a Lea-Francis engine. You don't get much more devious than that, do you?