Leaving EA relationship - do I tell him my plans or plot quietly?

[Cloudsgotinmyway]

I am a first-time poster and over the last year have been reading and drawing strength from other people's posts and advice. Sorry this is long, didn't want to drip feed.
I've been married to my H for nearly 14 years and have 3 DC - 10, 8 & 5. I'm from UK and we moved to H's country (near UK) after we married. I have my eyes wide open now to his EA behaviour, he is a narcissist and emotionally immature. I moved into the spare room over a year ago and have come to terms with the fact that my marriage is over.
I have fretted endlessly about the kids and that has stopped me walking out before. H has predictably said that he will not be leaving the house or the kids - but I can "fuck off". I am a SAHM and have no family here, his family are also abusive & I have as little contact with them as possible. DD makes 1st Holy Communion in May, so I'm staying put until then.
I've been thinking about moving back to UK and my family. My Mum lives on her own (DD died when my DS & I were babies). Mum is in late 70s & independent but has heart condition / on meds etc. My DS has MS, is in a wheelchair, is a recently single Mum (another twunt) to 2 DS (9 & 5) & is also independent - still working and driving etc. They will need my support in the future & if I am going to disrupt DCs schooling by moving I feel I should do it before DS1 hits High School.
Things changed in January when H went to UK to look for work & is based near my family. We have not had a proper conversation with the back of his head about separating. He's been back a few times to see kids and I say nothing as I would like him to remain in UK - it would make it much easier for me to move back if he is already there. He will not want the kids to leave here as he is very patriotic and believes "life" is so much better here and standard of schooling higher.
So, I've been plotting quietly, thinking about going to UK during Summer holidays and then not coming back. I've been putting money away & renewing work contacts in the hope of securing a job. I could move in with my Mum until I find work & affordable housing (haha). I have contacted local school/council re DC.
If you've stayed reading this long thanks! Friends in RL advise me that I should try to talk to him about my reasons for wanting to move back to UK rather than presenting him with a "fait accompli". Any advice?

[SquinkiesRule]

You say the children have passports from the country you are in (I'm guessing Ireland). If you are born and bred Brit they can have UK ones too eventually when you get time and money for such things.
Make sure it's legal to move them and then go. He's already in UK and a resident, working and has a bank account. It could look like you are moving the kids to be closer to him.