if you can get there tomorrow, then you can reserve here for Regent Street
http://reserve.apple.com/WebObjects/ProductReservation.woa/wo/39.0.1.0.1.3.0.7.9.10.1.15.0.1.1.1.1
Indeed but I got the message:
Were sorry, but there are no pickup dates available at this store. Please check back later, try another Apple Retail Store location, or shop the Apple Online Store.