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... having looked at the location, it would be better described as Martin Mere (WWT). The location comes out as just outside the main building, but the photographs don't seem to match.
I'd guess that it's planted Viburnum opulus from non-native stock - it doesn't seem to match the American (V. trilobum) or Asiam (V. sargentii) vicariants.
Lat/Lng: 53.6227, -2.8652
OS grid ref: SD428143