Grandma has offered to babysit one of the nights we're all in London Christmas week. Given the way our children eat, we will be eating all of our other meals in pizza joints and...pizza joints. So we'd like someplace VERY adult, either in cuisine or atmosphere or both. We don't mind spending some money (hey, grandma's not charging) but we do mind wasting money. And I guess we'd probaby not want Italian or French, unless it's someplace unmissable; we're thinking more along the lines of top-notch Indian or 'new' British cuisine. Any recommendations? Any overhyped restaurants we should avoid? Any idea whether most places are even open that week?