I want to accuse you that "you don't live in London" but your comment admits as much. London has a huge sprawl so walking doesn't really make sense. A few biki

I want to accuse you that "you don't live in London" but your comment admits as much. London has a huge sprawl so walking doesn't really make sense. A few biking lanes but not really relevant for most commutes. Public transport is great if you can use it, which generally means if you want to go to/from Central London. Buses are notoriously unreliable and will "change destination" at a moments notice. Yeah, the tube map looks "dense" on the map but see above for sprawl. Good luck commuting in any direction other than radially (unless you happen to be near an Overground line, which is a big if). In addition, most tube lines are closed at night and many have repairs done over the weekend. On top of that, late hours attract drunk / rowdy people, so I often prefer to avoid them. I'm fortunate to be able to use public transport for my normal daily commute, but I also often use other modes of transport (my favorite is bike, which public bikes make easy... again if you happen to find yourself near a station) over the weekend if I want to get anywhere "interesting".