He served as a Deputy Secretary in the Northern Ireland Office Office from 1980 to 1982, while resident in Northern Ireland. He held the posts of Deputy Secretary (Policy) and then Second Permanent Under Secretary at the MOD between 1982 and 1988 when he took up his post as Permanent Under Secretary of State at the Northern Ireland Office, an appointment he held until 1990.
- BLELLOCH, Sir John (Niall Henderson), Who's Who 2014, A & C Black, 2014; online edn, Oxford University Press, 2014
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