Black Sheep Ale...Is it veggie/vegan?

Well, after a quick email to the brewers (who replied in a couple of minutes), it conspires that Black Sheep's bottled is veggie, but cask isn't.
For the technically minded, this is because the bottled is filtered and therefore doesn't have finings added.
Despite what brewers might try to tell you, isinglass is not a by-product of caviar (it's now more often made from other fish), just like leather isn't a by-product of beef (by weight, it's the most valuable bit of a cow).