I've still no explanation as to how SWT have got it so wrong (and how they're getting away with god forbid, actually promoting a grade the government wants rid of!) - on the one hand we have 'essential member of staff we wouldn't be without'; on the other we have 'not worth having, easily downgraded, good to have in a reduced form but not worth worrying about if not' not to mention 'we employ absolute legends' as opposed to 'we're going to take your car park permits off you because you don't want us to mess you about'.
Having met some of Stagecoach's safety team I'm inclined to believe their position is entirely genuine as well.
I thought it was ironic that they needed that poster. I saw it at Shepperton when I was making my return journey from Waterloo. You would have had no idea either train had a guard were it not for the poster...