DS needs to make a daily commute from zone 2 to zone 4, 5 to 7 times a week for the next month, leaving in the morning during peak hours. There are 2 possible routes, one via zone 1, one avoiding zone 1 using the mysterious pink card reader that goes from zone 2 to zone 5 (by one station) and changing trains to back one stop into zone 4 on a different line.
The journey via zone 1 is much more expensive than the other route but the journey time is the same.
If you use the TFL single fare finder, you put in the start and end destination and it tells you how much a ticket costs for the different routes but there is no mention of zones. If you opt to buy a monthly travelcard, it asks you for your start and end zone (in his case 2 and 4) and gives you a price. There is no way to specify a route or that you interchange in zone 5 using the pink card reader.
DS (who has ASD) asked the ticket barrier attendant to confirm that if he is using the pink card reader and travelling from zone 2 to 4 via zone 5 (but not alighting), he doesn't need to get a zone 2-5 travel card. The attendant didn't know. DS has tried the TFL website, TFL customer services, made a special trip to an actual ticket office in a mainline station (the ticket office at his local station has closed and been converted to a Starbucks), Google and now resorted to the tried and tested solution of asking mum
None of us can find an answer.
If he needs a zone 2-5 ticket, it's nearly £30 cheaper to buy single tickets every day (based on him travelling 7 days a week, which he won't most of the time) and he probably won't do enough extra journeys in a month to make it worthwhile. If he needs zone 2-4, it is cheaper to get a monthly travelcard than pay single fares. But not if he ends up getting a fine...
AIBU to think TFL ought to know how their fares work? And ask if any of you have done a similar commute and know the answer? Sorry, it's a bit long and complicated!