I realize that talking about no go zones is a futile effort as noone can agree what constitutes one and until it is officially recognised, like it is in sweden, it is impossible to establish their existance as immutable fact, despite several indicators that such places are developing.
A subset of society withdrawing from the rest is not new or unique, behavior like harrassing those who tresspass in thier "muslim areas" (as seen here and here ) would not seem out of place if done by US gang-bangers or Mexican cartels.
It is the extent that the muslims communities of britain go to segregate themselves that is the defining and most worrying part of the issue; going to the extent of attempting to replace the english common law through establishing sharia courts (Documented here and here) and there have been some attempts to enforce it upon others through threats and the occasional attack.
The replacement of the local law with an older extremely archaic systems and imposition of said law upon both its members and those who intrude upon thier territory is a mode of behavior completely unseen in all other British demographics native and immigrant.
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