Exactly this. London Fields make beers which sometimes taste a bit muddled. Their double IPA is great though.
I had exactly the same experience as Cupcakes had with the ELB Oatmeal Stout once. It's meant to be very muted and soft. Mine was once vinegary when served in the Spoons in Stokey, and it's definitely due to it going off.
Just heading back from Manchester, and went to Marble Brewery's bar in town. £2.80 for a cask pint. Great, fresh ales, and they had a good mic of classic and what some would call craft.