As the 2012 RHS Chelsea Flower Show draws to a close, Alan Titchmarsh and Chris Beardshaw look back at the highlights of the event. From a floral scaffold pyramid to a topiary corgi, Alan and Chris celebrate the horticultural magic that has entertained the nation throughout the week. There is a look back at the big medal-winning gardens and nurseries, and a last chance to revel in the amazing plants on display. Show less