Strange how us knuckle-dragging F&L stackers can tell the difference between OX26 and OM15 when we issue it to sections but the highly-trained folk with fat wallets we give it to can't.
The station I'm at even handed out posters (produced through DFC West Moors I believe) to help those poor souls work it out. Bless.
Of course its never the fault of the line swine just those damned stackers again, expecting techies to interrupt their game of ping pong to actually RTFL.
Never assume, check.