Morris was educated at Ducie Technical High School and the University of Manchester. Morris joined the Manchester City Police in 1955 and by the time of the creation of the Greater Manchester Force was a Chief Superintendent. He was appointed Assistant Chief Constable of that force in 1976.
- St Mary's Priory, Abergaveney
- HMIC Profile
- "Previous Chief Inspectors". HMICFRS. Retrieved 7 September 2018.
- ‘MORRIS, Sir Trefor (Alfred)’, Who's Who 2016, A & C Black, an imprint of Bloomsbury Publishing plc, 2016; online edn, Oxford University Press, 2015 ; online edn, Nov 2015 accessed 15 May 2016
- "Chief Constables of the Hertfordshire Constabulary". Hertfordshire Constabulary. Retrieved 20 June 2018.