I won't break you down like some of the other posts, but there are things I think you should consider:
If you have read DR check out "Start with a Beginner's Mind." I think the other posters have preached to you the idea of "knowing what you know" and changing that to "challenge all your assumptions."
I am not expert on Islam and the faith, but I do know the ideology is to respect women, and prevent men from ogling/coercing men by covering up all of their body except for their eyes. This is very traditional, and some countries still follow this tradition (Afghanistan, Turkey, Iran). Some Muslim majority countries do allow women to wear "Western" style clothes which include Iraq. If you love your W then, guess what? You can choose between customs and love my friend.
I think some people may not be familiar with Islam and Muslims but with my work experience I have had some interaction and I can say I have some, but limited exposure.
So, my recommendation to you is this and it is NOT an easy decision; you will have to allow certain un-traditional ideas to happen to your W and in your home, or you can find a new wife with a more similar ideology to allow a more seamless cohesion.
I do not recall reading that your W was Muslim as well, but if she is not then this culture shift will be a HUGE thing to deal with.
To state for the record, I have no problems with respecting Islam and Muslims in general. Just know that your opinion, if religious in nature, will be a challenge in a Western culture, the UK is no exception.
If she came back DO NOT SCREW IT UP, but do sacrifice ideas if you really want your W back. The choice is yours. Good luck friend.
"Don't chase people. Be yourself, do your own thing, and work hard. The right people - the ones who really belong in your life - will come to you. And stay." ~ Will Smith