Thanks for everyones replies.
For the most part, everyone has confirmed my fears unfortunately.
Luckily I'm not in the position of having kids and a property here, however I have a very long term partner who is settled into a decent career here. I think it would be extremely unfair to ask her to drop everything to come and live with me in [enter place name].
I'm not completely unflexible and am willing to live in certain places in Europe, but to have no choice what so ever it something I dislike immensly. Like someone mentioned previously. Do I love pushing the thrust levers forward more than I love my friends, family and way of life to give up for possibly 6 days of the week.
Do you know your base before you commence training? I think I already know the answer unfortunately.