This is more complicated than the opening post suggested. But then again, life is.
I have lived in Denmark with my English husband, and it wasn't easy. The Scandinavian countries can be difficult to get work in if you don't speak the language quite well. And British expats have a tendency to make a nice little ghetto for themselves - have you ever noticed that there seems to be an Irish/Scottish/English pub in most capitals?
(also Scandis have a habit of insisting on speaking English to English people and not letting them learn the language)
In the end it was me who suggested that we move to England before the DC reached school age as I was not enjoying my teaching job or the area that we lived in. The first year in England was very difficult, and I often wondered if I had done the right thing. My MIL and SIL were not as helpful as they had said they would be, in fact, from our perspective we ended up helping them more than they helped us. We still don't have a very close relationship to them. Often I find it unfair that my family are far more interested in our DC, but they are in another country. And of course with Brexit I don't feel very welcome at the moment.
OP, it sounds like you have made a lot of effort to nurture the bicultural (great phrase from another poster!) aspects of your family life. It can be hard, I know. My DC almost always answer me in English when I speak Danish to them, which I don't do as much as I would like.
I understand that you are feeling insecure because "this wasn't part of the deal". But people change and evolve, and priorities change, work changes and the country you live in change. You as a family now need to make some new decisions. I can understand why your DH wants the well-paid job, but it does seem to come at a price for you as a family. I am thinking that your DH wants to buy a house as he feels that is the right thing to do as a provider for his family.
When you are a couple from different countries, there will be a lot of hard decisions along the way.
I do understand why you want to stay in England, but you need to find a solution that you are both happy with, if there is one, and it won't be easy. If your DH only wants to be in Norway for the well-paid job, then I think he will get fed up with living there after a while, so even for him it is probably not the right choice. How long has he been working in Norway now?