PREVIEW

A scout troop looks at paintings titled ''Dolbadern Castle, North Wales'' (L) by JMW Turner and ''A Boat Passing a Lock'' (R) by John Constable during a photo call at Tate Britain for ''Turner and Constable: Rivals and Originals'' exhibition which explores the lives and legacies of Britains most revered landscape artists: JMW Turner (1775“1851) and John Constable