I'm heading to London at the end of April for six days and am really confused about the best and easiest way to get around. Can anyone who has been please explain in simplest form what I need to buy to get around the easiest way? I've read a lot of blogs about the options and leave more confused about what to do. Isn't there anything I can just have on my phone that allows me to be tap on and be charged? We're also just planning on taking an Uber to our hotel from and to Heathrow so won't need to worry about travel in that zone. Thanks!