Gloucester Road Scene ?????

When I watched that scene where they leave the hotel and walk out onto the street, then into what is like a Shopping Mall where they spot the black dress.I at first thought it might have been that small mall outside the front of Victoria Train Station but then I thought the Mall is too long.So then I thought it looked a bit like that shopping Mall beside Gloucester Road Underground station and there is a bookshop near by there today like in the film.Of course it could be a completely different London location.Does anyone know where that scene was shot. Thanks...