Joe Swift and Jo Whiley are back at the RHS Flower Show Tatton Park, along with gardening experts Carol Klein, Adam Frost, Frances Tophill, Nick Bailey, Arit Anderson and Mark Lane. They reveal the winners of this year’s Young Designer competition. Frances celebrates ornamental grasses, Carol sniffs out the most fragrant flowers in the floral marquee and Arit takes a look round some of the small Back to Back gardens.