David Royle
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David Royle is a Labour politician in the City of Manchester. He is a councillor in the Fallowfield ward notable for defecting to the Liberal Democrats on the eve of 2005 General Election, only to defect back to the Labour Party the day after.
Reginald Hill's page has a link here: did David Royle play Sergeant Wield in the TV version of the Dalziel/Pascoe novels? Different David Royle, probably.