If you don’t have all day, this 75-min. whirlwind of the major sites gives you as much style as possible in a limited window of time: You ride on a modified double-decker 1960s Routemaster bus— for decades the standard for commuting Londoners—as a somewhat
hammy guide gives you the quick lowdown on everything you pass, from Buckingham Palace to the famous Tower Bridge (which you’ll cross).