Knell was educated at Trinity College, Oxford and ordained in 1929. Beginning his ministry with a curacy at St Barnabas, Southfields he was successively: Domestic Chaplain to the Bishop of Lincoln; Priest in charge of the Trinity College, Oxford, Mission in Stratford; Vicar of Emmanuel, Forest Gate, then Christ Church, Reading; and finally, before his appointment to the episcopate, Archdeacon of Berkshire. In 1972 he retired to Lingfield, Surrey and continued to serve the Church as an Assistant Bishop within the Diocese of Oxford.
- Who was Who 1897-2007: London, A & C Black, 2008, ISBN 978-0-19-954087-7
- The Times, Thursday, Jan 13, 1972; pg. 14; Issue 58374; col C Resignation of the Bishop of Reading
- Crockford's Clerical Directory 1975-76 London: Oxford University Press, 1976 ISBN 0-19-200008-X
- "Church Web Site 1". rdgchristchurch.org.
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