David Chipperfield Architects is behind the upgrade of the 19th-century Grade I-listed building on Regent Street, which has been closed for five years. The hotel will have 159 rooms with a midcentury-modern flavour, plus several restaurants and a spa. Rooms will cost from £450, but until March 2013 a special introductory rate of £350 is available, including a bottle of champagne and late checkout.