To go back to "what can we do to inact change?" the answer in all truth is probably to look for work elsewhere.
I have asked to go full time in my current role, was told there wouldn't be any need to do so and funding won't allow, I said what about reducing my hours so I can look for another job alongside this one, was told that wouldn't be possible as well, I am literally trapped in this job.
We all know that there really is no career progression, the pay is abysmal, and we can argue with the government over a pittance every few years, and have the same arguments and discussions further down the line for a pay increase that doesn't even cover inflation. We are losing out by staying in the role.
As a supplementary wage to a household, it is probably pretty good, but as a single man in my late 20s looking to get my own place and start a family, this wage doesn't cut it and it never will unless we somehow bargain for >40k annually, which is never going to happen.
We can argue about the 3.3% increase, but I'm going to get a different job.