The Tube, the rat run, the pain in the backside, call it what you will but the London Underground is perhaps one of the greatest inventions of the modern age, connecting the city and inspiring many similar infrastructures around the world. Millions upon millions use it, and whilst many of us may not look up from our phones and books to truly take in what is happening around us as we travel under London, Cockfosters, back for another sell out run, explores it in great and hila