Beeranalyst was talking to Dan from the Porterhouse Parliament Street last night and apparently TSB is being brewed by White Gypsy these days. I suppose it makes sense. The Porterhouse have a 40BBL setup, which it a lot of cask ale to try to get rid of in Ireland. Handier to get Culán to brew a more manageable amount.
Beeranalyst had some and says it has actually improved. They also had a cask of Helvic Gold on and there is a cask of Black Rock Stout in the cellar, waiting it's turn.