Monty Don and Joe Swift round up some of the week's events from the 2015 RHS Chelsea Flower Show. They meet the designer of the show garden that has won the coveted People's Choice Award. The programme takes an in-depth look at how innovation has shaped this year's show and, with the help of space scientist Maggie Aderin-Pocock, there is a look at some of the gardens and exhibits whose influence is out of this world.