In regards to the muslim statistics I got them from a bbc news article and it was based on muslims over 25 if I remember correctly. I also based it on that most of the women I see in the housing benefit office are muslim, but its possible they may have working husbands in a low wage job. I also live an a city which has a high muslim population it is also surprising that I dont see many in places I have worked whilst there has been many polish and asian workers. I am not saying I am right tho just based on my personal experiences and a bbc news article which of course could be inaccurate in itself.
I bet there is many hard working muslims as in all religions.
Here is the article, not sure if its the right one but has some stats there.
http://news.bbc.co.uk/1/hi/uk/4771233.stm