These kinds of issues are always very difficult. For most muslims UK/USA/Other Western countries are "their" countries. They were bron and brought up their so the "go back to your own country" can not apply.
They are considered citizens of their (that) country who want change. Nothing wrong with demanding change (whatever it might be as long as it is legally done)
We have ppl ON TV bashing gays, jews, muslims etc, and want to ban equal rights to some in the society, we have groups like the KKK who the govt does not clamp down on. So these ppl are not the first (and surely not the last) ones who want it "their way", which is fine by me as long as they ask legally & get it done legally.
Will they offend ppl...yes...but offending is not breaking the law.