The main purpose of Boundary Zone x tickets is to avoid the need to call at the boundary station. Obviously if you're on a Travelcard season it doesn't matter. In reality, as mentioned on here a week or so ago, many TOCs don't seem to mind tickets with a named station, I've even been issued them when asking for Boundary Zone 6, but strictly speaking it should be from Boundary Zone x rather than a named station, for a Day Travelcard on a 'fast' train.
That's what I've always thought. I do that type of journey a fair bit. However, recently I was travelling from Slough to London with a zone 1-3 travelcard, asked for a ticket to Boundary Zone 3, and only noticed when I was on the train that I had been sold a ticket to Ealing Broadway. Ealing Broadway isn't even the first station in zone 3 on the Great Western line - West Ealing is. I suspected I'd been overcharged (which I found when I checked that I had by about 80p) and, because it wasn't the first time it had happened, I wrote to FGW to complain. They have replied saying:
(a) that, essentially, the onus is on the customer to memorise the entire National Fares Manual and not on their employee to sell the customer the right ticket, even if specifically asked to do so by the customer (no surprise there), and
(b) "Although you are correct that a ticket from Slough to Boundary Zone 3 is £4.70, in order to purchase this fare you must be travelling on a service that stops at the first station within zone 3, which is West Ealing. As there are no direct trains to West Ealing from Slough, this ticket was not available to you and so you were correctly sold a ticket to Ealing Broadway, as this is the first stop within zone 3. So whilst both Boundary tickets and point-to-point tickets can be used in conjunction with your travelcard, the Boundary ticket can only be purchased if you are travelling on a service that calls at the Boundary station."
I can't see how (b) can possibly be correct. It not only contradicts RJ and Yorkie , but it also condradicts the practice followed without exception by (in my experience) NXEA, Southern, South Eastern and Chiltern, all of whom sell either Boundary Zone x or point-to-point tickets as travelcard extensions even where the train does not stop at the relevant station. If correct, it would also make Boundary Zone tickets redundant. If (b) is correct, though, then clearly on the FGW interpretation the High Wycombe-Southampton journey on a Boundary Zone 6 ticket using a fast train out of Waterloo is not permited either (presumably a more expensive Clapham Junction-Southampton ticket would be needed?)
The letter gives no evidence and makes no reference to the fares manual or any other document to back itself up, so it sounds rather like a case of FGW overcharging and then plucking an excuse out of the air, arrogantly assuming it will just be accepted.
Does anyone have anything authoritative on this one way or t'other?