On the recently-updated National Rail page for contactless caps beyond Zones 1-9 I've noticed Sevenoaks / Luton have oddly specific touch-in times (0902 / 0913) for off-peak capping easements.
The first eligible London-bound departure at Sevenoaks is the 0912, whereas at Luton the 0913 departure (on which the recently adjusted Off-Peak Day Travelcard is now valid) is only available if the usual grace period (3 minutes?) applies.
The first eligible London-bound departure at Sevenoaks is the 0912, whereas at Luton the 0913 departure (on which the recently adjusted Off-Peak Day Travelcard is now valid) is only available if the usual grace period (3 minutes?) applies.