Sophie Raworth and Joe Swift take an exclusive first look at this year's RHS Chelsea Flower Show, which returns to its spring date for the first time in three years. They are joined by Adam Frost, Carol Klein, Rachel de Thame, Arit Anderson and Toby Buckland, who showcase some of the most eagerly anticipated show gardens and discover the beautiful blooms in the Great Pavilion. Actress Caroline Quentin comes to Chelsea in search of inspiration for her own back garden.