Watch more at http://www.marksandspencer.com/MS-TV/b/311612031 Marks & Spencer create world's largest Union Jack flag from unwanted clothes Local volunteers & Oxfam create flag in East London in the time it takes to win the 10km Open Water Swim as part of Shwopping campaign Marks & Spencer (M&S) has been channelling the positive energy of the British public this summer by creating a giant piece of clothing art at West Ham Park today (Thursday 9th August).