Sandi Toksvig and Adam Frost kick off the flower show season with a glimpse of what goes into making the the Chelsea Flower Show the most eagerly awaited event in the gardening calendar. The Road to Chelsea goes from Grenada to Yorkshire and from Brighton to Cardiff by way of a leisurely cruise down the Thames. Sandi, Adam and Gardeners’ World presenter Arit Anderson meet some of the passionate growers, florists and garden designers whose skill, dedication and desire to be the best make Chelsea the most prestigious flower show in the world.