For a couple of weeks in September, thousands of buildings across the UK, mostly outside London, are open to the public. The Heritage Open Days are a UK-wide version of the London Open House events, and while the vast majority are open to wander in and look around, some require advance booking. And despite being “outside London”, there are some London venues opening as well. Guided Tours of The Chitra CollectionSt. John Street, London, EC1M 4ASThe collection curator will be leading free guided tours, exploring how tea became a global drink and shaped the modern world. Guided tour of Betchworth CastleDorking, Surrey, RH4 1NZJoin a Museum guide for a guided tour of Betchworth Castle with access to the castle enclosure which is usually inaccessible to the public.