It was a week when food industry execs took turns to explain their 2009 results to analysts and press. Hershey defended its strategy, Unilever acknowledged its challenges in Europe and Kellogg insisted its marketing was paying off - even as volumes fell. The UK saw the dawn of a code to oversee relations between retailers and suppliers - and the latter took the chance to hit out at their customers. And Kraft Foods boss Irene Rosenfeld revealed what it was really like when she met Peter Mandelson.