"Travelling in rush hour when you don't need to. Tubes, trains, and buses will be packed full of tired commuters who use these routes every day. If you choose to travel at rush hour, expect some grumpiness and shoving. If you have to travel at these times, then remember to step off and wait to the side of the doors to let people off. I promise that this will make travelling less stressful for you and Londoners!"
"Avoid the tube and stay away from major stations like Waterloo, Victoria, Charing Cross, Euston, etc, during morning and evening rush hour. They're so busy and full of grumpy commuters!! Much better to travel outside rush hour, when it's a bit quieter."