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I am in the same boat as you - I travel mostly off-peak from WGC-London 4/5 weekdays. My cheapest combination currently is:
1. Oyster zone 1-2 travelcard (nets me an annual gold card)
2. Daily Off-peak return tickets WGC-FPK with 30% gold card discount
This system seems likely to be the...
News update today- Contactless coming to Welwyn, but not Oyster...
No firm timeline, just sometime 'later this year'
https://www.whtimes.co.uk/news/welwyn-garden-city-oyster-and-contactless-fares-1-5977578