Allegra adds that the pressure on the poor performers could become intolerable as the housing market turns south, rents continue to rise and Tesco and Asda sell ever more soft furnishing and diningware. It claims that only John Lewis, DFS and Ikea, whose top three stores in the world are in Britain - Brent Cross, Croydon and Lakeside Thurrock - currently have the 'clarity of proposition' to succeed.