Day 8: With the pesky holidays out of the way, my parents get down to some serious tourist business. After a three-hour double-decker convertible bus tour (main thrust of the tour: London is fucking cold!), we had lunch at the crypt at St Martin in the Fields, where we had earlier gone to Christmas Eve Mass. Nice enough place, cafeteria setup. Its main selling point for me, after the bus tour, was that it was an enclosed space that served hot things to hold in your hands and/or ingest. There is a gift shop that my mom seemed to enjoy, and they also advertized a variety of concerts, jazz and otherwise. So that’s nice. After that it was the nearby National Gallery tour, and we winded up the day early to prepare ourselves for…