With regard to green ped aspect timings, these are, generally speaking, dictated by the width of the crossing, according to DfT minimum standards.
http://www.dft.gov.uk/pgr/roads/tpm/ltnotes/esignofpedestriancrossin4034.pdf
@dommyracer 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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With regard to green ped aspect timings, these are, generally speaking, dictated by the width of the crossing, according to DfT minimum standards.
http://www.dft.gov.uk/pgr/roads/tpm/ltnotes/esignofpedestriancrossin4034.pdf