I honestly have no idea why that would even be a problem. Considering that most people that celebrate Christmas in the UK aren't even Christians, and by that I mean people who "dunt believe in god lul". There's more religions in the UK than just Christianity and Islam. Why make other religions feel completely ostracised during that one time of the year? And before anyone says "Well, no one thinks about how Christians feel about other religion's holidays, so why should we care how other religions feel about ours?" Christmas is f*****' EVERYWHERE during that time of year; it's a highly commercial holiday. Fair enough if they don't believe in it, then maybe they wouldn't care. But the Jewish holiday of Hanukkah takes place around the same time of year, and it just gets completely over-shadowed by Christmas.
And the idea that the UK has ever been suggested as changing to be a Muslim country is fffff. Multiculturalism is a good thing at the end of the day. You know what the BNP is right? Y'know "Britain for the British." Well, apparently a British-Asian person isn't British enough.
Muslim extremists are bad, yes. But they're not the only people to ever terrorize society, for example, the IRA. And I don't think I've heard people complaining about us celebrating St. Patrick's Day. That's another form of multiculturalism ya know.