Last September I visited Bush House, the home of the BBC World Service. It was part of the London Open House weekend which is an annual event allowing visitors behind the doors of buildings not usually open to the public. This year it’s the weekend of September 18th and 19th. The brochure can be ordered from the official site. If you’re in London that weekend I would encourage you to find something to visit!
This year’s London Open House weekend is in September.