Thanks, this is very helpful. So basically this is a defect in the Thameslink website. I guess the safest thing is to get two Z6 travelcards or use contactless. Was leaning towards paper tickets as it's easier to have records for the purposes of filing expenses but I might use contactless.
To be honest, it's easy enough to set up an online TfL PAYG account and configure it so you get weekly or monthly statements with all your journeys on. I don't think that's much more complex than using a booking confirmation and picture of your ticket, but YMMV!
Interesting to note that Trainline charged the £38.70 price for the same journey (if you disable their splitting function), I assume it was charging based on the Heathrow Express route (but interestingly still suggested I take the Elizabeth line).
That's because the fare is valid on the Heathrow Express (hence the higher price), but the fastest itinerary involves using the Elizabeth line throughout. The suggested itinerary would likely involve the Heathrow Express, if you were travelling from somewhere that didn't have a direct train to Farringdon.
The excessively high
interchange time at Paddington (15 minutes) means that what accredited booking sites tell you is the fastest
official itinerary isn't necessarily what other systems - such as Google Maps, Citymapper or TfL Go - will tell you is the fastest
feasible itinerary.
I've always wondered, is it possible to get an orange travelcard inside London? Or can I get a travelcard "to" SAC for the return journey in advance at SAC when I depart?
You can buy inboundary Travelcards (i.e. ones that are only valid within the Zones) at any rail or Tube ticket machine, or buy them online and then select ToD for collection at any rail ticket machine.
Outboundary Travelcards (i.e. ones that also include a journey outside the Zones) can only be bought from a ticket machine if they have the facility to select a different starting station. This is because you can't buy a London Zones 1-6 to St Albans Travelcard, only a St Albans to Zones 1-6 one (so for your return journey, you'd just not make use of the validity between St Albans and Boundary Zone 6 in the "outward" direction). You can also buy them online and select ToD for collection at any rail ticket machine.
I'm finding exploration of BRFares.com quite fascinating, so thanks for the links. As someone in IT I do prefer it when I can get access to the "real" data the consumer-friendly interfaces try to abstract away and oversimplify.
No problem. Journeys to Heathrow are so complex in terms of fares (it's even worse if you're coming from the Reading/Woking direction as there's also the RailAir bus!) that it's almost impossible for any site to programmatically present all of the best options. The fact that contactless fares aren't all in the 'regular' fares database doesn't exactly help.
I already had to deal with the airline industry's ticketing systems, which are themselves their own microcosm of inscrutable complexity. Must be "fun" working on the systems for UK rail ticketing... not surprising they get it wrong sometimes.
Absolutely. Airline fares are hideously complex, but at least all of the rules are written down in black and white, so you can understand why you are (or aren't) being offered a particular fare and what flights you can expect to be able to book with it.