Monty Don and Joe Swift preview the Royal Horticultural Society's Hampton Court Palace Flower Show. In the first of three programmes, Monty Don and Joe Swift take a first look at the show gardens. James Wong meets the head gardener at Canterbury Cathedral, who is bringing his Japanese grass collection to the show. Rachel De Thame explores the famous festival of roses and Carol Klein is in the floral marquee looking at some of the stand-out floral exhibits. Mark Lane shares innovative garden ideas he has spotted at Hampton.