How would it make things easier? Well, pretty obviously, if you make things easier for the customer to buy the service they want you get fewer complaints and less incentive for evasion. It takes away the confrontation and, crucuially, the language of confrontation.
Be honest: which situation would you prefer to deal with?
A:
"Excuse me, I have a ticket for a different train, please can I buy an upgrade so I can go on this one instead?"
"Certainly sir, that will ^x, plus an admin fee of ^y" (The rules having been clearly and repeatedly explained beforehand, and ^y being reasonable)
Or B:
"I'm afraid that ticket isn't valid on this train. So I'm going to have to charge you full fare single ...well it did say on the website and on the posters... rules are rules"... National Conditions of Carriage Part 7, paragraph B etc etc"...
As I have said before - I have seen method B used on
XC▸ and everything was very polite and amicable.
I have also seen method A used a few years ago - including the guard/tm snatching the invalid ticket from the passenger whose railcard had expired - and it agravated the previouisly mild mannered passenger so much that the
BTP▸ was called.
The excess idea could work, if you miss your booked train they could allow the excess pluss ^10 admin fee (as is allowed if done BEFORE your booked train i.e. travelling too early) but these excess should only be available if done before boarding the train, if you just get on and hope for the best then you should be charged a whole new ticket as you would now, if this were the case then there would be an incentive for people to actually go and sort their ticket out before boarding rather than just getting on and hoping for the best.
But my point still stands about the UFN‡ process not working very well, if someone does get on the train with for example a reference number then they should be issued with a UFN (as now) BUT they should have this quashed when they appeal showing proof of purchase etc and maybe allow everyone 2 chances per year, as is the case with people who leave their season tickets at home now!
If there were proper ticket checks and visible staff on trains then it could be on the train see below.
This is an example of what I was referring to earlier- starting off with what makes things easier for the operator and then working out how to get passengers to comply with it. That isn't customer service, it is the industry making things more difficult for passengers as an alternative to providing sufficient staff to do on-board ticket checks properly.
As I've already said, the easy way to give people an incentive to upgrade at the station is to make it more expensive to do so on the train, but that's not the same as making it a penalty. If you treat people better, i.e. as customers rather than presumed cheats, the railways would have a better reputation and that would increase the number of people paying to use it.
Whilst we keep going back to the T&C's it is worth pointing out that the T&C's for Advance tickets are actually very simple and take up just one or two paragraphs so it isn't like when you sign a mobile phone contract with pages and pages of drivel, yes there does need to be a little more discretion built into the system and the best way that can be achieved is by having a system where any problems must be sorted out before travelling, the only exception to this would be from unmanned stations (as now) to just allow everyone to get on train and pay what they would at the station just wouldn't work, it takes me from Pad to Westbury to get through a train now, and thats good going, if I had to stop and excess every other ticket then most of the train would go free or on the wrong train, everyone would soon latch on to that idea and do the same, even when you have an assist it is difficult to get the train up tight so it just doesn't work!
How about making the T&C more accesible. Have a short summary available for AP purchasers. You say the T&C are shown at stations - challenge anyone who does not work for a train company to tell me where I can read them on a station (say at Swindon for example). To quote Douglas Adams the might just as well be "on public display in a locked filing cabinet in the basement of the Town Hall" so far as most passengers are concerned.