Around four million people in Britain will bet on the Derby today, but few punters realise they have hardly any consumer protection.

In his film, Mark Coton, a semi-professional gambler and founder of the National Association for the Protection of Punters, backs the call for change. As he explores the world of betting shops and bookies, Coton finds some who have won their bet but lost the pay-out in a system that's stacked against them.

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