I'm not shocked: don't forget, that one of the key things in Islam is to be loyal to the 'umma (the community of believers). That's set above any national feeling (which, at some stages in history, and some countries, was actually seen as being unIslamic and "Western"). Inevitably, there will be British Muslims to whom being Muslim is of far more importance than being British.
I think it's important also that documentaries like these are shown: there's too much minimising - ironically, mainly by non-Muslims - of the extent of these kinds of beliefs. They are there, they are more prevalent than we would like to believe - and they are certainly more prevalent than the Muslim community likes to believe. But it's up to us to work together to prevent people like this being given space - Muslim and non-Muslim.
There are quite a large number of people (percentage of Muslim population-wise) who are in favour of parallel Shari'a courts, to hold sway in Muslim cases. These aren't people who support ISIS, by the way (though presumably some of them do) - apart from the issue of parallel justice, how comfortable would you be knowing that in the case of a divorce, a woman would automatically cede custody of her children (at varying ages for boys and girls) to her ex-husband? Or that a woman's inheritance would be a fraction of that of her brothers, if her parents died intestate? And these are religious issues, not cultural ones.
I guess what I am saying is that it can be a slippery slope: which is why the more extreme elements need to be exposed and discredited, not minimised.
And for the PP who talked said that "Kurds are Muslim"? Some indeed are - but many are Jewish (though most of these now live in Israel, owing to anti-Jewish discrimination in the Muslim-controlled Kurdish areas such as Iraq and Iran), Christian, Yezidi and also a few Bahai.