I have had Betty Stogs a couple of times in Brighton on draught, I think It was in The Druids at least once and I'm pretty sure I saw it in The London Unity too. It's not the best Skinners beer though.
Very difficult to whittle it down to three beers and why but...
Cotleigh Old Buzzard, While on a fishing holiday, gravity fed from a cask and absolutely gorgeous ruby strong
Hick's Special Draught from the St. Austell Brewery, another fishing holiday, another series of happy struggles back...