None of us want to live in a caliphate, but what on earth makes you think that this might actually happen, to the point that you feel "petrified" about the prospect?
There have always been people with extreme views on the fringes of society, whether those are Islamic fundamentalists or far right wingers etc. What is it about this group in particular makes you concerned that it might become more mainstream?
Personally, I think the far right is a much bigger threat right now, but even then, I wouldn't say that I was "petrified".
On a scale of 1 to 10, how likely do you think it actually is that Islamists will establish a caliphate in the UK?