Overview: It's the final of The Great Chelsea Garden Challenge, a new competition for BBC2, and in this episode one designer is picked to design a garden on Main Avenue at the RHS Chelsea Flower Show 2015. The pressure is on as the final three designers go to the RHS headquarters in Wisley, where they have five days and their biggest budget yet to create a show garden that will prove they are worthy of going to Chelsea. Mentored and advised by Joe Swift, the designers need to create flawless designs along with perfecting planting if they want to impress judges James Alexander-Sinclair and Ann-Marie Powell and win this life-changing opportunity.