Here's the exact wording from the NRCoT:
NRCoT said:
2.3. When purchasing your Ticket, we will make available information on specific restrictions that apply to your Ticket (for instance the train services on which you can use your Ticket or the route(s) you are entitled to use) and, where possible, any known changes to planned services.
If you're buying your ticket from a station with an open staffed ticket office, in theory you should be able to ask the clerk to look up any specific restrictions in their TIS for you. The onus is on you to ask though. I believe that this satisfies the requirement.
However if there is no staffed ticket office, then I believe that the TOCs are not complying with s. 2.3. All the TVMs that I have used only advise that the NRCoT applies and where to access it online. If you're lucky they will also display a summarised version of the restrictions. I've just had a look at my local Southern S&B TVM (picture attached), and it only mentions
http://www.nationalrail.co.uk/tickets/ , which is a page describing ticket validity in general terms. The QR code goes to the same place.
You can't look up the full restrictions on NRE without knowing the restriction code, which the TVM doesn't tell you. If you're lucky, the ticket will have nationalrail.co.uk/XX printed on it, where you can look up restriction code XX that applies to your ticket, but you only get this information
after you purchase the ticket, not
when purchasing the ticket. The TOCs could easily solve this by making the URL and QR code displayed be the URL to the actual restrictions of the ticket, which the TVM clearly knows as it prints it on the ticket! NRE could also add a link to this page in the ticket restrictions summary by each ticket in the itineraries that the journey planner generates. That would be enough to satisfy me.
As to the OP's original problem. Whenever I break my journey, after each time I've used the ticket, on the back I write the date and the stations I've travelled between. I don't believe this really classes as tampering with the ticket and thus violating s. 4.7, as the whole front of the ticket is unaltered. I hope that if there is ever an accusation I am re-using the ticket, I can point to this to back up my story.