His shifts. Didn't you say when you were together, he had notice of his shifts a few weeks in advance, and now he's saying he only gets them on the Sunday night before the week begins? If so, I wonder if your solicitor could write to his employer and ask how much notice he gets?
If there's a letter from his employer saying he's given his shifts 2 weeks in advance, say, and he's telling the court he gets them at the last minute, it's not going to look to good on him. It's going to look like he's deliberately trying to be awkward.
Might be worth asking.
I don't know what the fuck the SW's playing at, but there are bad ones out there. My DH has a relative who was one, and I feel really sorry for anyone who had her on their case. She never married or had children, so doesn't understand all the things that come with having those relationships, and she's quite controlling and forceful. She's often told us what to do, expecting us to do it, has sent gardeners round to hack back bushes in our garden, and always complains to DH about our drive being untidy, even though he's been suffering from ill health, mental health, looking after me, working full time, and doing all the housework, since my cancer (terminal) was diagnosed 6 years ago, so the state of the garden, or driveway, is the last thing on his mind. And it's not done in a "being helpful" way, but rather as a "I don't approve of your neglecting the garden, so if I have to pay someone to do it, I will, and you've got no say in the matter" way. Gah! Sorry about that! But, yes, I do feel for the poor people who had to deal with her, she probably made things 10x worse for them.