Just noticed this in M&S Jervis. 33cl bottle, 7.2% ABV, so it looks like it's a straight re-badge of Adnams Tally Ho barley wine. Worth a go.
[img:1zvkyqfd]http://2.bp.blogspot.com/-03kn18pIqKk/TV2NBPgRBiI/AAAAAAAABcg/bLm_V1E21ms/s400/M%2526S+Southwold+Dark+Ale.JPG[/img:1zvkyqfd]