And to answer your specific question about UK unrest.
The British are generally reluctant to get off their backsides and protest. The only major ones I can think of are the Poll Tax "riots" and maybe the miners strike in the recent past (plus smaller protests like the petrol tanker drivers). Any others?
Other countires seem to take to the streets on a regular basis, the French for example.
I think it would take a LOT for the British to rise up.
However, Brown and nu Labour have put us in such a economic debt, and flooded the country with immigrants, that if things DO get bad we made see such riots.
If lots of people start losing their jobs, and taxes go up, and benefits go down, and we keep having to pay out a fortune for the EU, there could be a lot of very unhappy people around.
Mind you, they would have to stage the riots before Britain's Got Talent is on :-)