I hate London underground, I'm saying this as a person who lived there almost 5 years. I'm just tired of overcrowded places and this is one of it. From last year there's 24h service on weekends on major lines, that's good you can back home after party much faster and easier. You can use your contactless credit card or android pay or apple pay as well :) BTW, your posts about London bring me lot of good memories. Thanks!