I use
http://www.truecredit.com/ but I'm in the US, it monitors all 3 for any changes to your reports and gives you all 3 credit scores that you can update once a month, it emails you if any changes happen or if you bust over your credit limit accidentally etc... I took the free trial and have been paying $14.95/month now for over 2 years as my credit use to be not so hot but now it's pretty damn good so I wanna keep it that way, one of their email alerts did actually save my ass once.