I agree Iains that fundamentalist preaching in some radical mosques was ignored by the authorities for a long time. I suspect this was because they were trying to avoid causing an uproar among Muslim communities and ending up with rioting and civil unrest.

But while I support tolerance, there are limits to what can actually be tolerated. Pussyfooting around dodgy hate preachers is not the best way forward.

It's now regulated more stringently, but it went on for too long unchecked.

I've had to speak a bit sharply to that 'fundmentalist' couple of Muslims we keep seeing in Tesco. They wouldn't stop demanding that I change my religion, should wear a hijab and repeating that I wasn't really married to my husband.

Eventually my usual easy-going, polite and laissez-faire attitude snapped, and I pointed out that they were lucky to live in UK where we accept all religions and races, and I insisted they show me the same tolerance. My husband said a lot more (ie they were actually committing a crime!) and they stalked off.
They keep out of our way now... :)