Monty Don and the team continue their tour of the RHS Hampton Court Palace Flower Show. Monty and Chelsea designer Andy Sturgeon share their thoughts on 2013's conceptual show gardens, which offer unusual approaches to a range of thought-provoking subjects. Joe Swift and Ann-Marie Powell go shopping for the perfect garden in a pot, while Rachel de Thame meets the butterfly expert responsible for bringing a flight of tropical butterflies to a biome created at the show this year.