Overview: Alan Titchmarsh and Joe Swift host a 90-minute special charting the evolution of the modern mixed border from late Victorian times to the present day. Alan talks to designer Nigel Dunnett about his garden, inspired by the Victorian writer and gardener William Robinson, whilst special guest Laurence Llewellyn Bowen looks at the influence of nature on William Morris, one of the key personalities behind the Arts and Crafts movement.