Creighton Muirhead, 67, of the Lechlade area of Gloucestershire, was convicted of 23 offences of non-recent sexual offences against 19 victims which took place at a school in Dorking and a school in Swindon between 1980 and 2008.
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The victims were all former pupils, both male and female, of The Ruskin School in Swindon, Wiltshire, and The Weald School in Beare Green, Dorking.