It really is time ATOC etc tackled this. It is confusing, wasteful and ultimately completely needless to use so many ticket stock coupons for Advance purchase travellers. When checking tickets, you will come across numerous people on every train who are completely baffled, which then wastes time whilst you/they sort through what is actually required for inspection, and then explain which bits they need to retain for barriers/other trains etc.
One could suggest that a sensible option here, at least for those who receive their tickets through the post, would be to enclose the travel tickets in their current form and place all other information onto a simple sheet of A4 paper. This would be cheap, simple to produce and allow all the required details of reservations etc to be included, in plainer and easier to read form than what is currently produced on reservation coupons. There would be sufficient space on the paper (perhaps pre-printed on the rear) to enclose a handy 'user guide' to advise pax of what they need to know and do with their tickets and so on. This could be shown to the Guard along with the actual travel ticket itself.
As for those who are brave enough to collect their tickets from a TVM upon arrival, there would obviously need to be another plan here. It is a concern how many people fail to pick up all of their 'coupons', and then present to you a 'Collection Receipt' thinking that the one bit of card they saw tumble into the tray was their ticket, oblivious to the other bits they left behind. Do the machines make it clear enough, if indeed they point it out at all, that the passenger needs to collect X number of coupons? Why is there a need to produce the above mentioned 'Collection Receipt' (as opposed to a payment receipt), what purpose does it actually serve? If the person concerned has lost their actual ticket, the receipt will not convey them on a train, so what is it for? I have to say that I dislike the current model of collecting from TVM's. The machines themselves are far too unreliable for TOCs to entrust to them the provision of travel documents at unmanned stations, as clearly demonstrated by the worryingly high number of people who inform you that they could not retrieve said documents for various reasons. I know some may see it as a backward step, but I do wonder if it ought to be the case that all Advance tickets are issued by post, and must be booked in time for delivery to take place?
It is difficult not to feel that this problem is taking such a long time to resolve simply through a lack of any real urge to fix it.