They are all Camden / Kentish Town / Chalk Farm area, which is mostly NW1. See the map for locations:
http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&msid=113575046217065184621.0004717f3d7c7749bb97f&ll=51.549351,-0.144668&spn=0.020522,0.055747&z=15
@mattty started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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They are all Camden / Kentish Town / Chalk Farm area, which is mostly NW1. See the map for locations:
http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&msid=113575046217065184621.0004717f3d7c7749bb97f&ll=51.549351,-0.144668&spn=0.020522,0.055747&z=15