Precis (651) Limited | 19th October 1987 to 22nd January 1988 |
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Yorkshire Water Effluent Services Limited | 22nd January 1988 to 24th May 1994 |
Yorkshire Water Estates Limited | 24th May 1994 to 25th August 1999 |
Keyland Developments Limited | 25th August 1999 to current |