Eire 90
Image by CianMcLiam

https://archive.org/stream/jstor-20563510/20563510#page/n4/mode/1up

a mid 19th century article about bog butter. The author had tasted every example he'd got his hands on. Ewgh.

and also mentioned in 1753
https://archive.org/details/philtrans04498668
though the author isn't sure if it's interesting enough to mention, that bogs preserve things strangely. but it is really.

Rhiannon wrote:
https://archive.org/stream/jstor-20563510/20563510#page/n4/mode/1up

a mid 19th century article about bog butter. The author had tasted every example he'd got his hands on. Ewgh.

Ewgh indeed. Perhaps it matures like a fine wine in a cellar. Hmm.

Not sure even Lydon would get many takers for that, to be honest.

Nothing much to add to your spot-on analysis, but I do agree that it suffered from make-facts-fit-theory syndrome rather. The Iron Age is quite strangely represented in TV, I thought the same about that episode of the Neil Oliver series.