There's a revolution happening in London. But it's not a political one, or even a social one. Far away from the headline-dominating machinations of governmental Westminster and the bright lights of the glitzy west end theatres, an artistic revolution has been gathering pace in the East End of the city. Into this atmospheric, edgy neighbourhood come the artists, often incognito, to adorn the walls with their creative, talented, sometimes controversial works.

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.