How do I find my nearest Catholic Church?

I have tried using 'www.achurchnearyou.com' and 'www.findachurch.co.uk' but these only specify CofE churches... I'm looking for a catholic church to get married. Is there even such a thing as a parish for Catholic churches? Am i tied to the one nearest me? I can find two Catholic churches near me, but i don't know which one! Help much appreciated as there seems to be nothing on the web to help!