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Thanks for the ID. It was a toss-up between the two, to be honest, as they are not anything I know much about. The FSC fold-out guide said that Hawthorn had a red-brown margin to the scutellum, which I thought I was seeing.
My Flickr photos...
Lat/Lng: 53.88803380063, -0.89153409004211
OS grid ref: SE729441
Woodland Trust reserve