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Denise Coates*

Potteries-based Peter Coates, 69, built up the Provincial Racing chain of bookmakers. In 2000 his daughter, Denise, 39, suggested a move into online betting and Bet365 was born. The operation is now easily worth £175m. Coates, who owns Championship football club Stoke City, sold the shops in 2005 to concentrate on the online business, netting about £40m