If that is what VTWC is relying on to identify "valid" ticket holders, it is not acceptable because, as has been repeatedly mentioned in this thread already:
(i) a passenger could legitimately travel on a non-VTWC service from Lancaster to Preston, changing there, and
(ii) a passenger could be in the toilet between Lancaster and Preston and miss whatever ticket inspection takes place.
I'd argue that the entire edifice is rampantly anti-passenger (and I'm expecting a tediously officious response to this post, but we'll get to that later). The Preston/Lancaster discussion referenced early on in this thread was eye-opening for me, because (unlike most of you) I'm no more familiar with fare strategies than the average layman, and I've quite possibly been breaking the law for years.
I live near London. My parents live in Whaley Bridge, in Derbyshire. When I visit, I'll book a train from Euston to Stockport. If my Dad can pick me up I'll get off at Macclesfield; if not I'll continue to Stockport and get the appalling train to Whaley from there. Same process in reverse on the way back.
This has always seemed eminently sensible to me. In the event that I get off early at Macclesfield, I've thought to myself, the TOC is no worse off than the landlord of my local if I only drink 95% of my pint. Indeed, they're (insignificantly) better off because I've freed up the seat that I've paid for and I won't be requiring another cup of tea. It's certainly never occurred to me that I might be inadvertently criminalising myself.
I've no idea whether or not I'm actually allowed to get off at Macclesfield instead of Stockport. Perhaps there are "valid" demand-based pricing reasons why such a manoeuvre is disallowed, and I used the double quotes with deliberate intent because a typical passenger would have no earthly reason to believe that disembarking early might be an issue. Attempting to alight
after the intended destination, absolutely.
Before the intended destination, no, of course not. Why would it?
And so the crux of my complaint: to what lengths do the TOCs go, to inform passengers that they must not break their journey? I've never once, in twenty years of travelling to see my parents, had my attention drawn to any such stipulation. I've broken my journey on countless occasions, possibly illegally, but when printing my tickets at Euston I've never received a slip that says "By the way, do you know that you have to travel all the way to Stockport, or else you're committing an offence?" Likewise, no "Are you sure?" confirmation when buying my ticket. So, I will have to hope that I haven't committed any offences. Next time I will be sure to check the conditions of travel!
Which brings me to the tediously officious people that I mentioned earlier. "It's the passenger's responsibility to read the conditions of travel", bleat, baaa, etc. I've only encountered a couple of jobsworths over the years which, as I travel by rail a lot, means that the vast majority of rail staff that I've encountered are absolutely fantastic. Still, this being a popular forum, there are bound to be a few here who will trot out the line that it's "the passenger's responsibility to read..."
*snore*
Sorry, I'm boring myself now. So, sure, it's the passenger's responsibility, etc. And I will gracefully accept that advice from every single forum contributor who reads, in full, all of the text in the end-user license agreement that's available when they install a new piece of software on their phone or their computer. In the meantime, if the TOCs feel obliged to insist upon pricing strategies that defy common sense in the eyes of the typical passenger, then perhaps they might consider making the legal impact of those strategies more apparent at the point of purchase.