Mitchell would go on to hold incumbencies in Milton, Portsmouth and Frome Selwood, Somerset before being appointed Dean of Wells in 1973,[6] a position he held for 16 years; during his deanship he oversaw a major restoration of the cathedral.[7] In 1981, he was appointed to the Cathedrals Advisory Commission for England.[7] In 1989, he became Dean of Windsor until his retirement eight years later, when he was appointed a Knight Commander of the Royal Victorian Order (KCVO).[8]