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I don't attempt to resolve this group more narrowly than Phleum pratense agg., but the length of the inflorescence here matches Phleum bertolinii better than Phleum pratense.
I would go with P.bertolonii as well, just on size.
Thank you both, thats interesting, is that Smaller Cat's-tail? I'll stick with Phleum pratense agg., as you suggest, just to be safe.
Lat/Lng: 51.8774, -2.089
OS grid ref: SO939198