Which is the most important clock in the world? Many visitors to London would answer ‘Big Ben,’ even though this is officially the name of the bell behind it rather than the clock itself. However, as a London blue badge guide, I would say that the world’s most important timepiece is the John Harrison H4 which can be seen in the Greenwich Royal Observatory museum near where the Prime Meridian is marked on the ground.

Chinese New Year has arrived and as London celebrates the Year of the Dog with the biggest Chinese New Year celebrations outside of Asia, my thoughts turned to this city's longstanding love affair with man's best friend, the dog. There's a lot of puppy love in the Great British capital - a phenomenal 200,000 dogs and counting call London home.  That's almost twice the size of the population of Reykjavik!