Tesco regularly sell it as @jal123 mentioned, or at least it's in the Mather Avenue branch.View attachment 34740
My local has started stocking bottles of this, as it's a real ale that can be drunk out of the fridge, as an alternative to lager.
I had a few last night and it's actually alright for a bottled beer.
They make a number of fantastic ales including their Snowdonia Ale, although I've never seen it regularly on cask or at least in the local area.
Fortunately however, whenever we go to North Wales I usually stock up on the stuff.