Sorry for the delay in getting in touch with you! I'm the culprit and my Dad was Ronnie Hamilton. Dad came to TZ from Burma the first time during the war (1943) when he was tasked with training the KAR troops in jungle warfare. He was billeted in the Arusha district and was so impressed that vowed he would return after hostilities ceased.
This he did in 1946 and started farming in Arusha with his partners Bill Crosskill and Gladys Ryden.
I'll leave it at that for now and give you a chance to get back to me John.