Is there wi-fi on the public transit in London? I am going to be using the Tube and buses.
my experience has been that it isn't great on the tube. They are supposed to be making it better.
https://tfl.gov.uk/campaign/station-wifi
Read carefully about which network can receive which provider underground.
No wifi on red buses.
We just returned and found WiFi to be very very poor. For transit and walking, we found Apple Maps to be excellent and if we had Apple Maps plan the route for us before we went under ground, Apple Maps gave excellent up-to-date info on when trains were coming, what were the stops on the route we chose, and what platform to go to if we were changing trains.