Had a similar issue actually in W J Kavanaghs.
The difference being that the W J Kavanagh staff knew it was off and didn't serve it.
I asked for a taste of one of their casks, and upon tasting it you could tell it was off, but as the bar man smelled/tasted it also, he immediately said oh wait that's actually gone off, can't serve that.
Definitely could do with more knowledgeable staff in cask serving pubs (like the w j Kavanagh guys) that know how to handle cast and understand when it's beginning to turning.
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