 From 1931 until 1941 he was secretary to Cosmo Gordon Lang and became a chaplain to King George V. Already the Speaker’s chaplain in 1941 he became a canon of Westminster Abbey as rector of St. Margaret's, Westminster, commonly called "the parish church of the House of Commons".His brother was Air Vice Marshal Francis Don.This was followed in 1946  by elevation to the post of Dean of Westminster, a post he was to hold for 13 years, a period which included the Queen's Coronation  One other event in his time as Dean was the theft of the Stone of Scone just prior to the Coronation.