Check this out:
Paleo Directory - Primal Britain
I'm down in Edinburgh and buy the vast majority of my meat from Findlays butchers - all grassfed and local (though not organic), but it's pretty close to where I live so I make a weekly Saturday morning visit. I can also recommend Griersons (the best ribeye steak I've tasted in my entire life) and Peelham pork is amazing. But I daresay you'll be able to find more local suppliers.