Bit addictive https://london.metro-memory.com/ Am calling it a day at 50.1%
I did this on yet another cycling forum a couple of weeks ago and stopped at 61.2%. Eta - I spend 3hrs per day using Overground, Underground and Greater Angrier, between Forest Hill and Waltham Cross.
@JurekB started
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Bit addictive
https://london.metro-memory.com/
Am calling it a day at 50.1%