British Postal Museum and Archive
Opening Hours: Open Mon - Friday 10:00 - 17:00; Thursday 10:00 - 19:00; (and various Saturdays.)
This museum has archived the history of the postal service, communication, design and technology through 400 years of physical records of the post service's development. One highlight is the Royal Mail Archive with one of the world's great stamp collections. The archives are free to visit for research and the museum is only open for various tours and events.