Not Hackney but surely you could pass by
http://www.allinlondon.co.uk/directory/1163/20408.php
@fruitbat 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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Not Hackney but surely you could pass by
http://www.allinlondon.co.uk/directory/1163/20408.php