Marks & Spencer may halt plans to build a new store in the proposed new regional shopping centre in London's White City. It is four years since M&S first mooted plans to take part in the centre, which has been hit by a series of legal disputes with environmental campaigners. Now M&S, which last week announced a drop in half-year profits and plans to axe six stores, has said it was keeping its options open about White City. A spokesman said: "It's four years ago since the board approved the original decision and that authority needs to be renewed if we are going to proceed with it. Our situation has changed in four years. We are keeping our options open." The new shopping centre is being built by Chelsfield which, press reports say, plans to start on the first phase in the second quarter of next year. No one was available for comment from Chelsfield.