United Kingdom during her time of apex looted sub-continent, middle east and Asia-Pacific. UK forces not only ruined socio-economic system, they also planted seeds of sectarianism and xenocentrism among peaceful nations.
British empire consisted of North America, sub continent, middle east and informally China. Not only three continents they also ruled over seas with their monstrous naval power.
Though power of UK began to decline after 1st and 2nd world wars and now we have to find UK on world map ( I think it is somewhere in Atlantic). UK is still treated as a great power due to her so-called glorious past and being the largest economy of Europe after Germany.
Modern tiny UK consists four states namely England, Scotland, Northern Ireland and Wales. Northern Ireland is the disputed territory between Ireland and UK and for the same reason Irish Republican Army fought brutal war against occupied force. Till 1698 Scotland was an independent country, to uplift economy, government of Scotland invested abroad and got nothing. Consequently, Scotland bankrupted and signed an act of union with England.
After 300 years Scots want independence and want to dissolve their marriage with England. Economic downturn in the UK further enhanced demands of Scots and they think they are not receiving their due share in British treasury.
With discovery of North Sea oil in the seas of Scotland people of this region believe that with huge petroleum reserves and stable economy they can live independently and can implement socialist system (like in Norway and Sweden). Scots nationalist are promising free health and education with generous pensions for masses; nationalist parties of Scotland put independent Scotland in their manifesto and they are going to contest next election on same issue.
Independence of Scotland would eventually trigger sleeping liberation movement of Norther Ireland and any disintegration will push Wales another unit of UK with different culture and language. Welsh Nationalist Party promotes idea of independent sovereign Welsh state and like Scots they can opt breakup… If this happens it will eventually end idea of United Kingdom and tiny England with less resources and old population will collapse like a house of cards.