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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@SideshowBob
Heterodyne bat detectors - Bat Detectors - Bat Conservation Trust-
https://www.bats.org.uk/about-bats/bat-detectors-1/heterodyne