You and I are talking partly at cross purposes, Andy. You're seeing the question "Do they wish us harm?" as equivalent to a question like "How many Muslims would kill, or approve the killing of, a person who had insulted the Prophet?", and, further, I think you believe the vast majority of Muslims which falls outside that category has attitudes and values similar to those of you and me. I disagree with you regarding the proportion of Muslims who support violence: I think it's much higher than you suppose. But I also disagree with you and regarding the attitudes and values of the non-violent majority: I think there are large sections of the Muslim community which are opposed to what we used to call "British" values before "British" lost all value as a cultural descriptor. This latter group does not necessarily "wish us harm" in the sense the jihadis in the first group do: they just disagree with many of the things we do and believe in, and will work to change them.
On the first point let me offer some evidence in support of my assertion. I'm not trying to "shoehorn" anything: I rely on your expert scrutiny to tell me where my logic is "strained" or faulty. My evidence is the reaction across almost the whole Muslim world to the Charlie Hebdo massacre and the "Je suis Charlie" marches in Paris and other European cities which followed it.
You can do your own research on the extent of Muslim outrage, but here's one link:
http://www.theguardian.com/world/2015/jan/19/chechens-protest-cartoons-prophet-muhammad-charlie-hebdo
The 800,000 comes from a Russian news source and looks a dodgy number. Taken at face value this means half the population of Chechnya thinks the murder was justified.
And here's another one; you mustlook at this:
http://www.dailytelegraph.com.au/news/nsw/sydneys-muslim-community-rallies-in-lakemba-in-response-to-terror-attacks-that-rocked-paris/story-fni0cx12-1227195312315 are
That's 1000 of the Muslims in Sydney alone who support the murders openly! There are fewer than 500,000 Muslims in the whole of Australia, aren't there?
Now, regarding the second point - the non-violent majority. Firstly, I take you to task for what anti-Islamists like me are often falsely accused of: the assumption that "they" are all cast in the same mould. The "Muslim Community" so beloved by the multiculturalists is as heterogeneous as the the wider Muslim world in which it has its roots. I suggest two of the biggest differences rest in the degrees and types of piety on the one hand, and certain unpleasant "social" accretions" which may have been acquired, if not because of Islam, but at least unopposed by it.
The educated professional Muslims, the large and successful mercantile class, and the less educated who emigrated to Europe for genuine economic reasons are very unlikely to be inimical to the countries where they make their homes and in which they earn their livings. These are the Muslims most of us know.
But there are lots of Muslims most of us are fortunate not to know, but all of us will have seen and read about in the media. These "non-violent" Muslims often:
hate Jews;
hate homosexuals;
think Western women are sluts;
believe in the segregation of the sexes;
want to live under the Sharia;
burn books;
lobby for halal meat in schools;
lobby against the eating of pork in schools;
demand special treatment at work;
practise FGM;
And so on ad infinitum
Would you care to speculate how many such people there are in Luton, Bradford, Dewsbury , Rotherham and Tower Hamlets? No, neither would I. Do you think the presence of people with these attitudes is good or bad for the wider society? No, I don't know either.