When Did Big Ben First Bong?

Millions live there, millions more visit each year - but how many really know London?Find out:- How New York's famous Central Park came to be modelled on a seventeenth-century London square- When Primrose Hill almost gained a pyramid even larger than the Great Pyramid of Cheops- Why about 640 people came to be drowned in the Thames in a single night- What the royal family might do to escape London if the balloon ever goes up