London has its own tree, the London plane. It's a hybrid of the American sycamore and the Oriental plane that supposedly grew when they were planted next to each other in Vauxhall Gardens in the 17th century.
They are all over everywhere! They're one of the most popular street trees in many cities around the world. Incredibly robust, hardly susceptible to any insects, etc etc.
https://en.wikipedia.org/wiki/Platanus_%C3%97_acerifolia