Puzzled

I'm having to take a very non traditional approach to this London Underground jigsaw. The entire background is silver, meaning that it is very difficult to start with the edges, which is what I usually do. So I started with the Thames and now I'm working line by line (Circle, District etc.).
In other news, Wee B set up a beauty salon this evening and I got my makeup, toenails and a foot massage done, all for 50p. Bargain! She's looking for other customers too, if there are any takers...