It's often not too bad if you're leaving from Soho, but redevelopment has pushed lots of entertainment out of Soho, so I'm likely to be starting my journey home from Camden, Islington, Shoreditch or Waterloo.

If the tube ran at night, I could reasonably stay out late in Zone 4+! I can't remember the last time I did that. (Why might I want to? Because people live there, and have BBQs etc.)