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The stems did not seem sufficiently "winged" to fit Water Figwort, also they tend to be redder in this species, more green (as seen here) in Common Figwort.
I'm not sure about current distribution, but I thought Water Fogwort had a more southerly range.
and added a shot of the stem and lower leaves. If the question is "who's more likely to be right - cicuta58 or me?", then I'll go with Water Figwort!
The lower leaves confirm S. auriculata!
Lat/Lng: 54.5984, -1.3
OS grid ref: NZ453228