Few transportation maps can boast the pedigree that London's iconic 'Tube' map can. Sported on t-shirts, keyrings, duvet covers, and most recently, downloaded an astonishing twenty million times in app form, the map remains a long-standing icon of British design and ingenuity. Hailed by the art and design community as a cultural artifact, it has also inspired other culturally important pieces of artwork, and in 2006 was voted second in BBC 2's Great British Design Test.brbrBut it almost didn't make it out of the notepad it was designed in.brbrThe story of how the Underground map evolved is almost as troubled and fraught with complexities as the transport network it represents. Mapping the Underground was not for the faint-hearted - it rapidly became a source of frustration, and in some cases obsession - often driving its custodians to the point of distraction. The solution, when eventually found, would not only revolutionise the movement of people around the city but change the way we