Marriott Rewards members can receive an upgraded room at a 50 percent discount at 11 London properties through March 9, 2013. Stay on a weekend and you can reserve a premium room for half of the normal upgrade cost. The discounted upgrade is eligible on Thursday through Sunday nights and a Friday or Saturday night is required. Participating hotels include Grosvenor House, London Marriott Hotel Regents Park, London Marriott Hotel Park Lane and London Marriott Hotel Kensington, among others. The discount applies to the cost of a paid upgrade (not points upgrade) and does not apply to the standard room rate or tax. Visit http://www.insideflyer.com/link/?7985 for more information.