File photo of shopping trolleys in front of a Tesco store in Kensington, west London

 
File photo of shopping trolleys in front of a Tesco store in Kensington, west London
Shopping trolleys are seen in front of a Tesco store in Kensington, west London in this April 19, 2011 file photo. REUTERS/Toby Melville/Files (BRITAIN - Tags: BUSINESS)