I've just skimmed through this thread and I haven't seen the answer to this.
GWR, on their web page on the new penalty fare regulations (
https://www.gwr.com/help-and-suppor...tm_content=EB1226872&utm_campaign=GWR_PEN_SER), say that
"If you buy a ticket that has restrictions, and/or a Railcard discount, you must ensure you adhere to any restrictions and have your Railcard with you; otherwise you’ll need to pay for your journey again at the full price."
There is no "could" in that statement, it says "need".
Does this mean that if I board a train with an invalid ticket due to peak restrictions, even if I'm not penalty fared I'm required to buy a new (anytime?) ticket rather than having it excessed?
Even if there's no ticket office at the station I board that could excess it for me?