Honestly, its all about how over time, the differing classes have split, to the point where they are alienated from the others and feel rather confused over what england is.
The middle classes have been spurned on by the need to express themselves through consumer culture, yet are increasingly scared by the media into believing that all they can do is move away from problem areas are so they can pretend they don't exist. Yet the basic tenant of middle class life means they no longer get on with the new people who live round them, leaving them with only the need to preserved what little they have left of 'middle england', creating hostility for everyone else as the shit on lower classes in an attempt to make themselves feel better.
Meanwhile, most working class people just get on with their lives, most in poverty, which leads to confusion and anger at life. The BNP are harnessing this to their advantage in some areas, promising tougher laws and harsher punishments for wrong doers, whilst hiding behind the lie that 'they are just the bloke down the road'. To add to the mix, somewhere along the line, nationalism has gotten mixed up with racicm and the ideals of the nazis (trust me, half my dads mates don't have any idea as to the difference, thinking its ok to fly the Nazi flag as its just the same as ''being nationalistic'').
In all fairness, its always been like this in one way or another, but with the acceleration of culture (24 hour media alerts, the internet), so has come the acceleration of the processes of these norms to a possible end point. As few have to time to process the information before they are bombarded with new fresh ideas, confusion reigns, and any large companies or governments in the public eye are feeling the flak. Its why governments seem much less responsive than they used to be, the media is faster and always focusing on a new way they have messed up whilst they are still trying to clean up things reported upon months or years ago.
The basic system that used to run the country (feudal which in someway gave way to the class system) has somehow over time become intermingled with consumerist ideals, until we are bombarded with the idea that the only way is up, something people believe today. Now whilst there is nothing wrong with that, it has led to a lot of the current social tension in the past 25 years. If I'm an idiot and can see that, then the true scope of the problem is far worse and multi-faceted that we can ever hope to deal with soon.
EDIT:Bear in mind, that the above is just scratching the surface. Immigration has somehow been turned into a dirty word, and people we welcomed with open arms ten years ago now have hate heaped upon them. The topic is just so large we could spend years discussing it only to find the topic is no longer relevant enough. The human brain is good at either the small details or the large sweeping ones, rarely both at the same time. Add a government in and you can see why its 'failing Britain'. People just aren't designed to make decisions at such a large scale.
