Easter Sunday falls on the first Sunday after the full moon following the spring equinox on 21st March. This unusual calculation, which uses a mixture of solar and lunar calendars, means that the day itself can occur anytime in a period of over a month - between 22nd March and 25th April. The next time it will fall this late will be in 2038 and you will have an even longer wait for a very early Easter. It will not take place on 22nd March until 2285.

Tourist guides are normally concerned with what is above ground, but London also has a fascinating underground story. As well as the famous buildings you can see on the surface – Westminster Abbey, Saint Paul’s Cathedral, Buckingham Palace, and the Tower of London – London has a network of underground sewers and rivers that repay close attention.