Frances (3rd L) and Keith Smith (3rd R), who run bookshops in Warwick and Kenilworth in Warwickshire, pose for pictures as they arrive with their sone David (L) and his wife Jennifer Strejevitch (R), MP Margaret Hodge (2nd L) and MP Chris White (2nd R), at10 Downing street in central London on April 24, 2013, to hand in a petition signed by more than 110,000 people calling on internet retailer Amazon to pay their fair share of UK tax. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)