Boardingpass
Quite often rail tickets are not inspected, e.g. my journey on the Heathrow Express yesterday.
Nonetheless, the NRCoC of the UK ATOC says
A ticket may only be used by the person for whom it has been bought. It may not be resold or passed on to anyone else unless this is specifically allowed by the terms and conditions which apply to that ticket and which are set out in the notices and publications of the relevant Train Company.
Clearly this a revenue protection step - even though a train ticket does not include the name of the passenger
If the airlines did not run some type of revenue protection scheme, then people would book early and resell, at a profit, on eBay, just like ticket touts.
So there is a strong element of revenue protection in airline procedures, which makes sense.
or you're not an airside garbage man who's just been made redundant with a score to settle
Good job that airside garbage men, with a score to settle, can't afford free tickets from a well known loco
Can we just agree that the reason boarding passes are checked at the door by UK carrier is that the UK authorities require this?
And as many people from the rest of Europe say, the UK is different in many ways.....