Ribble Valley: Amid the rolling hills of Lancashire's Ribble Valley-the inspiration for Tolkien's Middle-earth-Larry discovers the secrets of drystone walling and sees how the meadows are under threat. In Northcote Manor's walled kitchen garden, Maureen learns about heritage vegetables and Lancashire hotpot. In Yorkshire, actor Don Warrington shares his passion for 18th-century art and design at Harewood House.