Slowly getting there on with Boris Bikes

I finally worked out that the way I was generating the code to create the lines was unintentionally a weighted average of the number of journeys in each direction, so although the lines pointed in the right direction, they weren't as long as they should be. However, I've tracked down the mistake in my processing and all is go.

I've recoloured this map, with 25 per cent of journeys which are the least common shown in blue - some of these have frequencies of only 1 journey in a year. However, it's clear that Boris bikes are predominantly the domain of short distance riders - a ride out west further than Whitehall or Trafalgar square from Wapping is a rare event.