Thanks bry. After a little more research I learned it was in fact Jock Appleton which is reassuring-my memory is still OK and not suffering too much from CRAFT yet.
He won the Masport Cup with Elray in 1960 and again with Elray 2 in 1965.
Maurice (Morry) Dunn was killed in Elray 2 in 1965 while attempting to break the Australasian water speed record. Can anyone supply a date or venue?