Incumbents
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Peter Knight Walker
1977 - 6 December 1989
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Stephen Whitefield Sykes
1990 - 31 July 1999
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Anthony John Russell
2000 - 28 February 2010
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Stephen David Conway
6 December 2010 -
1977 - 6 December 1989
1990 - 31 July 1999
2000 - 28 February 2010
6 December 2010 -