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Hi. As far as i know, supermarkets like Tesco and Asda support local projects and therefore if you phone up the store you want it in and speak to the store manager or trading manager then they can help you. If you want it nationwide then phone up the head office.
Hope that helps.
Beware, supermarkets can be a bit funny. If you have shelf space and run out of stock, they will "fine" you. If you're stock hangs around too long, they will "fine" you so you need to keep your stock levels just right. Or so I'm told by a guy I know who markets mobile phone stuff.