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Agree that it is next to impossible to tell Z.lonicerae and Z.trifolii apart from a photo, but the location here (Liverpool area) would seem to rule out trifolii, which as far as I know is confined to places further south.
I don't want to open the debate again, but NBN maps show both in the general area, so caution seems sensible.
My Flickr photos...
Lat/Lng: 53.4272, -2.8552
OS grid ref: SJ432926