Because that's easy to administer and not a complete operational nightmare
Just the 3 options. Pay in full lets Dentists go to the front of the queue. Pay 50/50, (two months pocket money for Mamils?) Pay 50/25/25, (three months pocket money for enthusiasts?)
@mespilus 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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Because that's easy to administer and not a complete operational nightmare