I moved from UK HE to Ireland for my postdoc.
You are probably much smarter than me (because I didn't know this until it happened), but for the love of God have a plan to get your PPS number asap, because without you'll be paying emergency tax and it's a lot.
I found Ireland terrifyingly expensive (and I didn't need to pay for healthcare, but was a bit nervous about that) - but I was in Dublin, and Dublin property/rental prices are absolutely ridiculous.
I don't know how much of my experience of HE itself is about moving to Ireland and how much might be because I also moved subjects slightly, but I found it quite a culture shock. It was very, very hierarchical and I felt sexism was more tolerated. But, I must admit in an adjacent department I met some lovely women who weren't snobby at all - a prof friend of a friend was welcoming; that sort of thing. I was also a bit surprised by the drinking culture - after seminars, we (plus postgraduate students) were all encouraged to go socialise in the pub. No one seemed to think we should change this practice if we invited a Muslim speaker, either. Personally I found it really weird and inappropriate.
I didn't do an enormous amount of teaching (it was mostly a research post), but I wasn't super impressed TBH. I had a student who plagiarised quite jaw-droppingly badly, and pressure was put on me by the university to minimise it, and to give the student the chance to correct their 'mistake'. The student was unable or unwilling to do this properly, and again, I was pressurised to pass them even so.
Sorry to give a negative picture! I am sure there are lovely things about Irish HE and I know friends who have enjoyed their work very much, but ...