The zig-zag lines mean you're approaching an adjacent pedestrian crossing and they're a warning for drivers to slow down/stop for crossing pedestrians. It's also illegal to park/stop in these lines unless a pedestrian is crossing.
http://en.wikipedia.org/wiki/Zebra_crossing
More information there.
As for the police boxes, no we don't. Not that I've ever seen one anyways :)
What are the zigzag lines in the center of the roads for? I've seen them on TV and in a racing game.
Actually, here's another one. I've been watching Dr. Who recently and I'm curious as to whether or not they still have police boxes.