It fills me with fear, when I think about it. I always look forward to visiting London for shows. The last talk I did was at The Counter Terrorist Symposium in London Olympia. Any excuse to prove to myself that tracking, even in London can be easy.
I usually pick a track and will keep my eyes open until I pick it up again. Because there is always building work going on, the entrance/exit from the shuttering/tarpaulins makes for gold top track traps. Or for fun, find a track which is in hot tarr( from melting and becoming softer during the baking summers),or wet cement, maybe from years ago and see if you can find it again in the vicinity.
Strange as it may seem there is quite a lot of vegetation in London, keep your eyes peeled for animal habitats.
Anyways, hopefully Ill see you at the talk, which strangely enough will have loads of tracking.