I don’t understand this: “if both ends of the journey are beyond zone 6 then a cap will apply but an extension fare will also be charged if that cap is reached”, what do you mean please?
What I mean is that the contactless only caps are between the outboundary station and zones 1-6. If you travelled from Dartford to London, did some other journeys on the tube, then went to Slough and back and finally back to Dartford, you’d be charged the cheaper of:
- Slough cap and two singles between Dartford and zone 6
- Dartford (zone 8 cap) and two singles between Slough and zone 6