I have discovered a 1.80 adult oyster fare from Watford Junction to Chesham. Seamingly that would be the lowest oyster fare per mile. The single fare finder doesn't indicate a need to change at Kenton / Northwick Park as "avoid zone 1 fare".
If so, what will be the default routing of the system for such a journey? I doubt a Euston / Euston Square interchange can qualify such a cheap fare.
If so, what will be the default routing of the system for such a journey? I doubt a Euston / Euston Square interchange can qualify such a cheap fare.