steve smith became a self-made multi-millionaire with birth of poundland .
52-year-old started life in business on his parents ' saturday market stall .
he opened first poundland shop in 1990 when he was just 18-years-old .
sold the firm for £ 50million in 2000 and gave half the profits to his parents .
despite his wealth , his wife tracy gives him ' £ 10 - £ 20 pocket money daily '