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I think you are very likely correct in saying this is Trichiosoma lucorum, but the species in this genus are very variable and I don't think I could confirm it for certain without seeing it from other angles, and knowing if it was male or female.
Entomologist and biological recorder
I had no idea what it was! Someone helped me out on an insect Facebook group!
Lat/Lng: 56.714, -6.147
OS grid ref: NM463657