Hey Big Spender - who are the top spending retail advertisers?

With the current lack of consumer spend a constant worry for retailers at the moment, they are more keen than ever to spend on marketing that is guaranteed to deliver. Supermarket giants Tesco, Asda, Sainsbury's and Morrisons were all among the big spenders last year as the retail sector invested £15bn in advertising. Here, The Drum takes a look at the breakdown of this spend and the mediums it went on.