Is this Amphibious Bistort?
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potemogeton or amphibious bistort
University of Edinburgh and Biodiversity Observatory (OU)
Potamogeton is a genus of Pondweeds, whose leaves look superficially similar to Amphibious Bistort. As far as I know, it is not another name for Amphibious Bistort.
Edit: Sorry, I might have misunderstood...I though you were offering alternative names, but probably it was alternative identifications! ;)
My Flickr photos...
Some species of pondweed, especially Potamogeton natans, are superficially similar to the aquatic form of Persicaria amphibia, both in the habit and shape of the foliage, and in the size and shape of the inflorescence. So it can be hard to tell them apart at a distance.
If you can get a close enough look at a leaf (I've been reduced to using cameras at maximum zoom before) Persicaria amphibia has pinnate venation, and Potamogeton natans has parallel venation.
I think that the photograph above is Persicaria amphibia, but I can't put my finger on why it is.
Yes, those were alternatives. I was viewing this observation in the new Android app (test version) and entering the comment from there, so being economical with words.
I would have thought the bright pink flowers spikes are a good indicator of Persicaria amphibia!
Lat/Lng: 56.6829, -3.1671
OS grid ref: NO285551