On the other hand I have to learn Norwegian. I've also heard that it is a very closed society and that alcohol is extremely expensive.
I love the UK, I just can't stand the retards that live here.
I am really stumped here. It is not a lot more money to live in a more expensive country. But a country with perhaps more to offer a young family (I have two young kids).
Would you move?
Have to disagree with some of the posters here. Oslo has its dark side: I've walked past druggies injecting openly there, for instance (I confess to being shocked and hurrying past). It also has its vibrant side, though your city life will be that much more limited until your Norwegian is good enough to enjoy the theatre, for instance. It wouldn't be my first choice of Norwegian city (Trondheim would, out of those I've seen) but I'd take it over London any day.
Main advantages: you're within reach of real countryside, and your rent money will get you something decent. Apart from that, the question has to be your character: whether you're up for something new, or whether you'll be forever whinging about [whatever] in the UK being better.
As for pay, I understand it's a lot flatter there than here. But you can see for yourself: Norwegians are very open about it, and there's a government website where you can see the full details of anyone's income!