Well, had another talk with boss this week after we identified a conflict of interest discussing a raise. He advised me to go talk to other colleagues first. So I did, and got some decent feedback - supportive of asking for a raise or new terms, but warning me off calling anyone's bluff as it won't go down well.
Yesterday I was handing over as I'm away next week, and asked for a formal pay review. Boss tried to say "We'll chat about it when you're back". No, we won't chat about it, we're chatting now. I told him I want him to make contact with HR and draw up whatever is on record from my negotiations taking this role last April, and come back to me by phone. Then we'll talk about how much change I've implemented in the lab this past year.
Really starting to feel like his approach is just to placate people and put them off indefinitely