Via their Facebook page (https://www.facebook.com/yorkshiresquarebrewery/posts/1239865556125764, retrieved July 2017)
"Oh, and our beer is always vegan too."
Brian notes: "I further asked them specifically if they use animal products such as gelatin or isinglass for filtering/processing and they replied 'no we do not!'"
Yorkshire Square Beers
Vegan
This product is listed as vegan friendly.
What the company told us
Correspondence on record, with the date of each entry.