steve smith , 52 , grew up helping his father run a stall at the age of 18 in 1990 .
the venture was an overnight success and he became a self-made millionaire when he sold poundland shop in burton-upon-trent at the age of 18 in 1990 and sold the firm 10 years later .
mr smith lives in a 13-bedroom mansion in shropshire , which comes complete with its own swimming pool , snooker room and pub .