Free £5 off when you spend £20

I picked up a voucher at WHSmith ,by the self check outs .It`s a voucher that gives you £5 off £20 spend.And it`s valid every time you shop,so not only one off,between 28 Nov -18 Dec.There are the usual exclusions,like gift vouchers,phone cards,Day out vouchers ,too many to list but basically the voucher applies to ALL books,Stationery,Cards& Wraps,Art abd Crafts,Toys and Games,Christmas Gifts (with a parcel sticker),ALL drinks,Confectionary and Snacking.