With help from Twitter friends it's more likely to be Yellow Shell
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This is not Common Carpet (Epirrhoe alternata); compare your picture with those above. However, I don't know what it is.
I'm stumped - I can't find a obvious match in Skinner but also I'm not a very experienced at moth id
Lat/Lng: 56.9478, -6.3411
OS grid ref: NM361924