Which version? There is Acorn Brewery's Barnsley Bitter which is to the original recipe and uses the original strain of yeast. Or there is the version brewed by, what was, Elsecar Brewery which has now moved to Blackpool.
Lundhill Tavern does the, I think, Acorn variety... Horseshoe on Wombwell High Street allus has an Acorn beer on, more or less...