Norway has a population of 5 million.
Its' wealth is driven by North Sea Oil.
The rest of the economy is dominated by state-ownership in strategic areas - real socialism.
Iceland (the country not the company) has a population of 325,671...
The country was on the road to ruin before the financial crash. It had to take on both World Bank & EU loans to bail it out
Fishing amounts for 27% (over a quarter) of the countries GDP.
It creates electricity from geothermal and hydroelectric energy sources from its' environment.
The manufacturing it does that accounts for another 21% of the GDP are all based around high electricity usage products - aluminium smelting for example.
England has a population of 53 Million - 10 times Norway & 162 times Iceland.
It has very little in the way of natural resources - the boon of North Sea Oil wasted by a variety of Governments.
So England is too big & has too little in the way of resources to do what either of the above have done & 'go it alone'...