Well - currently the UK has the City of London, which makes much more money than the Norwegian fund. Now, you could argue that The City will be swept away by global forces and brexit - this is possible, and you could argue that The City was here before north sea oil, and you would have a point. On the other hand I would say that the flood of money through London from north sea oil played a significant role in providing capital for speculation and investment and without that The City might have lost out to Paris or Frankfurt in the 1980's and 90's.