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Adam Hildreth

Hildreth,  22, from Leeds, is a classic entrepreneur for the dotcom generation. He came up with Dubit, a website for teenagers, when he was 14 and left school at 16 to run it. Turnover in 2006 will be £1.5m. His other interests include Crisp Thinking, which specialises in child-protection technology for internet service providers. His share in these businesses takes him to £22m.