Finding cheap things to do in the United Kingdom is a decidedly hit and miss affair. On the one hand, this is an immensely expensive country that would charge you for breathing if it thought it could get away. On the other, museums and galleries are almost always free to enter, and there are also plenty of parks, statues, libraries and centres that don’t cost a single penny to explore. When the British economy explodes that might change, but at the time of writing…