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I'm not sure that this is Gunnera, but whatever it is something has been having a good chew at the leaves.
How big were these leaves and were they spiny?
University of Edinburgh and Biodiversity Observatory (OU)
While I was writing this someone suggested butterbur and I think that this is more likely.
Lat/Lng: 53.4, -2.4
OS grid ref: SJ7595