In my youth, I travelled about on the Underground all-day-long, five day's a week as a messenger boy! Got to know London very well back then, quite a number of times I innocently walked into 'non-train users areas,' and seeing deserted underground stations completely empty, eerie and void of anything except old tiles on the walls, and posters from yester-year.
Spooky ~ yes they were, very spooky, I almost found myself trapped inside one those abandoned and deserted stations when I realised that I was locked and gated inside one of the old entrances!
Purely by chance, an underground train worker happened to be passing by on the pavement outside the gate, and noticed me locked inside and unable to get outside, he managed to find a key from somewhere close by to my relief.
Never really liked London much itself though, it had a many quirky areas of course, but most of the people were self-motivated and didn't speak or acknowledge other people in any way, shape or form when passing except for the market places. I found it sometimes quite interesting just to sit back a while and observe all the other people as they went about their business, what they wore and the way they acted back in those days. (Carnaby Street Day's)