Original clue above.
It is taken from the pic below as seen at Fernside (near Rangiora) on 30-04-2011. The day of the memorial service for the designer, builder and owner of this aircraft.
It is of course the Maurice Paton (Special) Monoswift ZK-MPS (c/n MPS001).
The engione is a 4l Rover Discovery V8.
Well done [again] QW.
I am afraid you will have to flick me your fish mail address again - tks