Chris Beardshaw explores the horticulture of roses with the help of master grower Douglas Gandy and exhibits at at Castle Howard and the RHS Hampton Court flower show. Series producer Colette Foster ; Executive producer Tony Laryea (S) (W)BBC MAGAZINES: Gardeners' World, price £2.60; Gardens Illustrated, £3.50 BBC BOOK: Rower of the Moment, price £18.99 Second-hand rose - Gardening: page 16