I have been out over the last few days with the objective of logging some miles for the London Cycle challenge, rather than mapping, though a few minor detours to collect some missing road names. However I have been a 'customer' of OSM, especially with regard the Colne Valley Cycle route. My aim was to pick up the route from Dalton Way in Watford and head south to Harefield but I missed the almost hidden 'start'. However I found it using the mobile app MapDroyd populated with OSM data and showing the cycle route. This came into its own again when the signposts for the route had been turned.