The latest Oyster and contactess extension started today and brings Cuffley, Bayford and Hertford North into the Oyster system. Cuffley is in zone 9 while Bayford and Hertford North are in the same pseudo zone as the Broxbourne to Hertford East line. Fares to London Terminals will be cheaper than currently, and holders of zip 16+ cards will also enjoy half adult rate fares.
The fares have been set by GTR. An initial analysis has revealed some unfortunate scenarios between Hertford North and Southeastern stations. The default fare assumes travel via London Bridge and St Pancras and is National Rail only. Avoiding zone 1 fares have been set up via Stratford and Highbury & Islington but these cost more than the default because they include Undergorund and/or DLR travel. They also require you to touch the pink readers at both stations, but if you ignore this you’ll be charged the default fare (ie less). It’s a bit of a mess.
Another anomaly is that zip 5-10 holders travel free from Hertford East, but they are charged child fares from Hertford North.