Last year, I needed to travel to the other side of the world. Because of the long distance, I had to stop over at London. I decided to take the next flight instead, so I would have 18 hours transiting time to get out of the airport and spend half a day in London.
London is a very walkable city (at least for the area that I went to). After landing at London Heathrow, I headed to my hostel, which is right next to the british museum, and dropped off my luggage. From there, I covered British museum, Soho, Trafalgar Square, House of Parliament, Buckingham Palace, Piccadilly Circus, then back to the hostel by walking. Everything is in close proximity.
I went there around early November, thus, daylight is very short. Sun goes down early around 6pm, and it doesn’t come up before 8:30am or maybe even later. The long gloomy weather is just not very welcoming.
Obviously, half day is not enough to know a city. I hope I could visit London again.