All of the Sixpoint beers in Wetherspoons are good. They're not a promotional September thing, they have been selling them for a few month as part of their move (or introduction) to craft beer.
They are re-branding from tomorrow and will also be selling Lagunitas IPA, Devil's Backbone IPA, another from Brewdog and some Adnams ones. Not always been a fan of Spoons but with the quality of some of the beers they are getting at the price, can't go wrong.