We have several temporary posts in my department. It was seen as a way of trying to help newly-minted PhD students, give them some solid teaching & admin experience, ad bring them into a supportive departmental atmosphere. They are advertised openly, and are generally 0.5te for a calendar year, teaching only.
Not ideal, but actually they pay better than the same hours on an hourly-paid rate. These are precarious contracts, and we've had push back from a couple of postdocs who weren't re-employed. But we warn PhD students about the situation, if they have half a brain they can see it for themselves, and I like to point out that it has never been easy to get a permanent academic post I finished my PghD in the early 1990s, at a time when there was still a bit of give in the system, and of my PhD cohort (I trained in one of the largest departments in the country for my discipline - humanities) probably only 2 or 3 of us, out of the 20 who started together, actually got in to lectureships, and not straightaway - I did a couple of years on short-term junior Teaching Fellow contracts.
Turning hourly-paid budgets into annual contracts is a good step I think, but it means we have a lot less money for hourly-paid tutors - in fact, none.
We use PGRs for some hourly-paid work, and they are paid a package which includes the time spent face-to-face teaching in seminars, plus the time they sit in the lecture, and a few hours pay allowance for meetings of the teaching team, plus a rate for marking.
That pay rate for PGRs doesn't cover the actual hours spent, but as I explained to one of my PhD students, we see it as professional training, rather than an income as such.
What shocked me in previous strikes was the anger directed at "them" by my own junior colleagues - I pointed out that as an HoD, I was one of "them." And that if we wanted humane and rational management, we needed not to turn this into "us" and "them."
But I think it's got worse. I'm on strike today & I'll strike on the last day, but I cannot afford to strike nor do I think hat this strike is appropriate or effective.