Help finding tournaments

Image used without permission from WestGamer

I'm wondering if anyone out there can help me.  I think I'm starting to get my army up to a half-decent level of units that I'd be happy to put on the table, I've got most of my 1000 - 1500 pt force painted to a tabletop level and thought I may try my hand at playing in a tournament or two, just to see what it is like.  Problem is I don't know where to find out about what tournaments are on.

Does anyone know of a centralised location (or small number of locations) that you can look to to find out what and where tournaments are on throughout the year (preferably for the UK of course) so I can see if there are any that fit the bill for what I'm looking for.  There must be some way that people find out about tournaments but I know it certainly isn't through any part of the GW website that I can find.

Thanks for any help, bG