It’s raining in London and your plans for the day were a walking tour and a wander through the parks. We share how much it really rains, what to pack, 12 things to do when it’s wet and a one-day itinerary that keeps you almost entirely under cover. How much it really rains in London (about half what Sydney and New York get)The Met Office and BBC Weather apps, and why the hour-by-hour view mattersYour three choices on a wet morning: carry on, swap your days or leave LondonWhat to save for a dr...