I've seen it for sale down here in south west uk and thoroughly recommend it
If I remember the Black sheep brewery was set up by the son of one of the famous brewing families (theakstons I think but I might be wrong on this point) who was reckoned to be a "no hoper" and was pretty much shunned by the family. ie he was the black sheep of the family, hence the name of the brewery.
I've drank it Draught in Newcastle too.
Oh.... I've just re-read your post and I'm not sure if I should reply. I'm not a Yorkshireman.