I’ve never agreed with the notion that “Any price is worth paying to save our own full timer jobs, and any price is worth paying via pay cuts”.
All the times I’ve ever been got rid of? - has been because the Union there wished it. 
No Union? - I’m a LOT safer in the workplace.
A driver’s pay is low enough that one should be hired or fired over one’s ability to drive the truck without costing the firm extra money in the process.
It should not be about political correctness running up a tab at the firm “trying to cover their own positions all the time”, which all-too-often results in yours truly getting the bullet, and even then - "only by indirect read: “Dishonest” means.
To date, I’ve been let go from a total of 7 jobs over the past decade, and sacked never. BUT only 3 of those 7 were “redundancy” reasons, meaning the other four are■■?
I was never sacked from Royal Mail nor Manpower, nor Waitrose nor Staffline - and yet have been treated like I was ever since.
Unions are there to protect full timers from reducing in number. - that’s it.
What puzzles me is why people would rather be “booted upstairs” from Driver to acting manager role, rather than just take a payoff, and walk away completely? There’s even a cap on the amount one can get from a redundancy package these days, so the LAST thing an old hand should think is “My job of 20+ years is worth more than THAT” when a redundancy package is offered for one’s early exit…
Those who chickened out, ducking the VR package?
…Did life get better for you later? Did it f—! is what I keep hearing from those I know and knew from the full time world. 
There’s always someone worse off though…
Another driver i used to know that started same time I did (i.e. had same seniority) got fired on a pretence shortly after I left RM with a decent payoff… He got bugger-all of course, and that’s a threat EVERY long-standing member of staff has over their heads these days… “Got rid of, so the firm didn’t have to pay out redundancy”… At least I managed to dodge THAT bullet back in the day!
It also made me “never regret” leaving when I did, because I would have shortly have been next in line to be “Clintoned” - had I stayed… 