>>>such a thing would not have happened in pre multi immigration England.
While I generally agree with AOG that rampant immigration in the last few years has been (and will continue to be) a huge problem in this country, I cant agree AOG with your above statement.
As an example there were riots in Birmingham in 1791 (and before), more here
http://en.wikipedia.org/wiki/Priestley_Riots
Mind you, the difference here is that immigrants (who just dont feel part of this country) take any opportunity to have a riot, and soon decend to their baser instincts by looting etc.
I am afraid like oil and water (which dont mix) we will have this problem for decades as different ethnic groups will continue to dislike each other.
For example the Asians dont like the Blacks and Muslims dont like Jews and so on.
And it used to be such a great country to live in.