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Donald McIntyre Sinclair ( -1971)
1947 Bio Note. 
Mr. SINCLAIR was educated at Bearsden Academy and the Royal Technical College, Glasgow.
He served a five-year apprenticeship with Albion Motors, Ltd., at Glasgow.
He then became branch engineer to the British Petroleum Company, Ltd., at Bedford, Croydon, and Bristol successively.
Mr. Sinclair's next appointment was as assistant chief engineer of the Northern General Transport Company, Ltd., of Gateshead-on-Tyne.
Later he was appointed as chief engineer of the Birmingham and Midland Motor Omnibus Company, Ltd., becoming the general manager of this company three and a half years ago.
1971 Obituary 
Donald McIntyre Sinclair, CBE, (Fellow), who was the General Manager of The Birmingham and Midland Motor Bus Co Ltd until his retirement in 1966, died on June 17th. He was educated at Bearsden Academy and the Royal Technical College, Glasgow and then served a five-year apprenticeship with Albion Motors Ltd.
He then became branch manager to the British Petroleum Co Ltd at Bedford, Croydon and Bristol successively. His next appointment was as Assistant Chief Engineer of the Northern General Transport Co Ltd of Gateshead on Tyne. In 1940 he was appointed Chief Engineer of the Birmingham and Midland Motor Omnibus Co Ltd, becoming the first General Manager three years later.