At the Hampton Court Palace RHS Flower Show, Joe Swift is at the new Growers Marquee where he meets the Grow Your Own Enthusiasts and attends a cookery demonstration with some leading chefs. Rachel de Thame is in the Rose Marquee finding out about the new rose of the year. With climate change and its impact on our plants a key talking point at the show this year, RHS gardener, Matthew Wilson visits the Loire Valley in France to find out how a warmer climate would change our gardens.