Apologies, I should have provided one. The info is in a javascript window though, so, no link, and people need to call up the SWR ticket selling page, search for a journey. Once you have a ticket displayed, use the llnk to display the pop up window with information about that ticket. I can't recall the type of ticket that produces that particular paragraph - perhaps they all do. As an aside, that site isn't keen on selling return tickets (and often it's not keen to sell a bog standard open single, whether peak, off peak or that other sort of SWR off peak ticket - I no longer have sufficient head round SWR ticketing in order to understand/explain it.)

Mark

 
I Googled a key phrase.  SWR are simply quoting from the NRE list of changes for each ticket type on for example https://www.nationalrail.co.uk/ticket-types/tickets/sdr/ (you need to expand the Refunds and Charges block).  It should therefore be authoritative, albeit a little vague ("should be made" and "in most cases" are unhelpfully imprecise) and certainly doesn't cover a change of plan after starting a journey but while still within the coverage of the original ticket.  Can you pay for the extra bit on-train if a suitable member of staff is available?

Incidentally, the NRE website continues to be an absolute mess.  I can't work out how to reach that page via a menu, and if you do instead drill down the menu layers from the front page you reach similar but even less detailed pages also mentioning the changes, so there are multiple sources to maintain.  I'm amused also to see old ticket type names still in use behind the scenes; replace "SDR" in the link with "CDR" for instance and you get a page about Off-peak Day tickets.  (Now I'm down a real rabbit-hole; SVR also took me where I expected it to, as did SDS, SOS and others)

 

Hello Mark. Would you be able to provide a link to the web page that you quoted?

Thanks...

 
How does this compare with the ticketting provisions of the National Rail Conditions of Travel, and if not, which is authoritative?

 
The quote below is from the South Western Railways ticket selling site. Does the paragraph indicate that some circumstances that were formerly able to be addressed by the train manager now need to be sorted by either ticket office staff or the online ticket selling site that sold the original ticket?

Mark

Changes:

A ticket will need to be changed in order to travel to a destination further than where it was purchased to, change the route of the ticket, change the class of travel from Standard Class to First Class, or change the date of travel.Changes to tickets purchased online should be made by the retailer from which the ticket was bought. Staffed station ticket offices can also make changes in most cases, provided that this is done before the start of the journey.NOTE: A change to the date of travel can only be made BEFORE the date on which the ticket becomes valid for travel. Other alterations such as changes to the route or class of travel will be subject to a suitable alternative Anytime product being available. In some cases, it may be cheaper to purchase a new ticket.