Thats a relief - after 6yrs of mountain climbing in the UK, its nice to have a smaller hill to walk up.
Oh, I can tell you that it will be *much* easier in terms of paperwork here! If you weren't married to an EU citizen, it would be much harder - but in your case, it should be pretty straightforward. Effectively, you can work as if you're a Polish worker :)
Is teaching children paid less or the same as adults? I've got a UK CRB check, but is there likely to be anything else I need?
It can be paid even more - there's a lack of natives who can teach kids. Most of them can (in theory) - but it's a job far more suited for a woman. And there is a real lack of native English speaking women outside of Warsaw that want to teach - it's just a matter of finding someone to employ you.
The thing I'll say is that you shouldn't come to Poland until August or so. Schools will have made their plans for the rest of the year by now, but if you come in August, you'll be ideally placed to slot into a school for the coming year.