Who is the best-selling writer in history after Shakespeare and the Bible? The answer is Agatha Christie who was born in Devon in 1890 but whose stories often feature London and who wrote what is the capital’s (and the world’s) longest-running play The Mousetrap, which is still playing at Saint Martin’s theatre sixty-five years after it opened. One of the original cast was the late Sir Richard Attenborough, who was paid partly with a share of rights from the play. These were never expected to be worth much but later in his career he was able to sell them to help finance his film about the life of Mahatma Gandhi starring Sir Ben Kingsley.

London was built on clay so it was harder to build high than in New York, which stands on rock. For many years the tallest architects could construct a skyscraper was 5 - 600 feet. Then new technology allowed them to build higher and London’s tallest building is currently The Shard next to London Bridge, which is over 1000 feet tall. One Undershaft in The City was built to match The Shard in height and it too will have a viewing tower with an education centre operated by the recently renamed London Museum (formerly Museum of London).