He was the son of the Rev. A. G. Pentreath, Army Chaplain's dept.
Havard became a chaplain to the armed forces during the First World War, serving from 1915 to 1919, retaining an honorary commission as chaplain to the forces, 4th class.
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After completing his articles in 1883 he became assistant in the office of Alexander Ross in Inverness before moving to Glasgow to work for Campbell Douglas & Sellars and then for the Glasgow South Western Railway Engineers' Department.