LOL yup, I note the redundancies are voluntary redundancies and they've had 5000 volunteers:
More than 5,000 applications to quit cast doubt over rationale behind summer travel chaos
www.telegraph.co.uk
The shift pay argument seems fair enough if that's true, the stuff about new roles is suspect, I suspect individuals aren't getting their/ grades downgraded but rather new staff will be.
If you've automated a ticket office etc.. but pledged not to lay people off (save for voluntary redundancies) then you'll have to find other roles for people. I suspect that going forwards, with modernisation, some roles/pay grades won't be needed.
It just seems like a mix, some of it is reasonable grievances some of it is a bunch of Luddites contributing to inefficiency.