Yes, I met a girl from Texas who took the ONP class with me. Continental basically set everything up and she was going to live just a couple of blocks away from the hospital. I think the staffing ratios are a bit heavier (depending on what you're used to) according to a couple of people that I've spoken with. I don't know any specifics, unfortunately.
Having a general adult degree shouldn't really matter in regards to NICU, although I think it does matter if you wanted to do PICU. From what I've read, most people do a post-degree course in neonatology in the UK, so it's not like a peds degree is required.
Here's a link to my experiences in getting the PIN: https://allnurses.com/international-...se-651871.html
I'm not over in the UK right now; this is something that DH and I would want to do after we have kids in the future. It was a bit of a headache, but definitely worth it. I would definitely recommend the Bournemouth ONP; it is a lot of self-study, but a good way to learn about how the NHS works. I particularly love the NHS constitution which states something to the effect that care will not be given according to ability to pay.