Yeah, Serge's post kind of made me go "huh, I didn't think that UCU Solidarity were dodgy", but looking into it I realise I was thinking of UCU Branch Solidarity Network,
who are on twitter at ucusolidarity, whereas Serge's post seems to be a reference to UCU Solidarity Movement,
who are on twitter at ucu_solidarity. I'm not going to make a Monty Python joke here because those jokes stopped being funny before I was born, but god it's hard to avoid them sometimes. (I don't know much about UCU Branch Solidarity, they seem sound from what I've seen of them but am not a UCU member or really involved in this stuff.)