London is so vast I end up spending hours travelling on trains. They are by far the best way to travel around on and are always full of weird and wonderful characters.
East london spot with a bit of everything, food during the day and cocktails, music and cinema during the night. Few nice places around like E5 bakery, Netil 360 rooftop, and Mare Street Market
Founded in 1828 the museum houses around 67,000 specimens many of which are now extinct or endangered. My favorite is the skull of a Bottlenose Whale from 1860.
A slice of Scandi in the heart of London. Great for lunch, with all the meatballs, salads and classic Scandi foods you could want, along with a great little deli shop too.