I agree with the comments about seven sheds. Some good beers, can be a bit hit and miss, but generally pretty good. Having met Willie Simpson a few times I have found him to be a bit rude, almost to the point of telling him to stick his beers up his @#£*%. He doesn't sell wholesale, so the cheapest place to buy beer is from him directly.
Also check out the Morrison beers while your down here. Have a look at the Facebook page. It will tell you where it is on tap.
You also have 2m tall, but I haven't tried any yet, so can't say if they are good or not.
Iron house brewery is OK. Tried a few of their beers at beer fest, and quite enjoyed them.
If you get up to the north west coast, I normally have 3 beers on tap that you are welcome to come and sample.
Cheers LagerBomb.