London Green Cycles is similar https://www.londongreencycles.co.uk/
Re. London Green Cycles, I spoke to them a couple of months ago and they were really helpful. Give them a ring because their site isn't great.
@Jonny69 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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London Green Cycles is similar https://www.londongreencycles.co.uk/