Yankeegirl, I just read this thread recently, and just a friendly word of caution, not just for you, but for anyone
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--- remember that what you're feeling for him right now is lust, which is easily mistaken with being madly in love. You barely know this guy, remember. And lust can be a very dangerous thing when it involves moving to a whole different country, and even more dangerous when kids are involved.
You say you are already engaged, but as someone who's been there, I truly think only after your first meeting should you even consider taking your relationship to a more serious level, and even after that take things slow, because both of you will still have your guards up and you can't REALLY know someone from just one visit. Believe me, I know the desperation you feel! But you really need to visit him several times after that, and even have him visit you once or twice, to really REALLY get to know him and solidify the relationship. Basically, to test it out and see if it really DOES work out between you -- so you don't jump into things and cause major heartbreak.
You may think you know him now, but you only really see the side of him that's sitting in front of the computer screen, no matter how much you talk. Believe me, I thought I knew my guy after SIX months of chatting, but I learned about a million things more within the first hour of meeting him physically. To be blunt, you don't know how bad his temper really is, how he has treated previous women, etc., until much later, when you both become comfortable enough around one another to fully let down your guards down enough to have your first REAL fight. That can take many more months yet.
Abandonning all that you know in America to move to England is a whole lot different than visiting on vacation. Once the novelty and excitement has worn off, it becomes just as much as your day to day life as your life was in the States, and you may find yourself feeling very isolated and alone. Furthermore, if for whatever reason it doesn't work out after all, you will literally feel trapped in a foreign country. Plus, your kids may have quite a lot of difficulty adjusting to a completely foreign school system and completely different kids.
I really hope I haven't totally put you off, I kind of went on and on here. Sorry.
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I'm just trying to give you a fair warning from someone who has also had the experience of falling in love with a Brit, except for me, it's Scotland, not England.
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But no matter how you slice it, it's an adventure, and I honestly hope everything goes well for you!
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~Honeybee