Waiting for a bus to the West End near St Paul's Cathedral, an open-top double decker rolled along on the number 23 route. This is odd. Open-top buses are usually reserved for eye-wateringly expensive guided tours. However, it's a standard bus number, and the conductor was happy to let me on. Cue a very pleasant ride down Fleet Street and the Strand, wind (intermittently) in my hair and sun (except when shaded) in my eyes, looking at the varying building styles along the way.