Overview: Nicki Chapman and Toby Buckland explore the exhibits created to mark the Queen's Diamond Jubilee, ahead of the monarch's visit to the horticulture show. There is also a chance to see new plants named after members of the royal family, and florist Simon Lycett joins Nicki to produce an arrangement dedicated to Constance Spry, the woman responsible for floral displays in Westminster Abbey for the coronation in 1953.