I also hugely dislike how many UCU members are imploring students not to cross picket lines. How about no? The students don’t owe you solidarity because you’re upset about your working conditions. They are the ones paying fees and have every right to cross whatever picket they want seeing as they aren’t striking.
They do, of course, but I often find that actually students who want to be supportive don't really know how, so they don't know, for example, any of the discussion or history around non-strikers objecting to crossing picket lines, or that this might make any difference. Plus, last time around some of my students told me that they found it uncomfortable crossing, and were relieved to be told that they could choose not to, if they wished. (Although nb for those with international students, if their class is taking place then choosing not to cross is not treated as excusable re. visa attendance requirements, so it's really worth their being careful of those).
So, on the whole, I am in favour of putting no pressure on students either way, but am absolutely in favour of making sure that they know that they are allowed to express their perspective on this too, whether that's by actively supporting or actively not supporting the strikes! Sometimes, otherwise, they can feel they've lost their voice a bit.