This is young yob/mob beahviour.
Not radical Islam. Its simply outright destruction for its own sake. Those who are doing it, their only religion is the X-Box, Playstation, drink, drugs and sponging off the state, with a bit of violence on the side.
As pointed out, some of the rioters have tried to attack mosques. Religion?. They dont care about it.
Better have good security come for next summer, when London hosts the olympics.