Bill Surh of Peninsular Air Services owned VH-REL in the late sixties and early seventies at Moorabbin. 'REL' was indeed an ex cloud-seeder and he also, later,(1970?) had a contract with the CSIRO for seeding, using a Twin Bonanza, VH-CLO an ex Conellan machine. Very little use was made of it in the cloud-seeding mode. I cannot remember why. The 310B was a totally different animal to later 310s' especially the 'Q' onwards, but great fun to fly, very light in roll. I saw 'REL' in Hamilton in the early eighties while visiting the Ansett Museum. The pilots for the CSIRO contract were Bill himself and John Fleming. Sadly both were subsequently killed in aircraft accidents. 'CLO' was painted two-tone blue with the CSIRO badge on the rear fuselage and fin. After the contract ended the aircraft was painted in a yellow scheme and ended its days on the Cairns fire dump.