Struggling with this one!
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Thanks, Douglas - I can see that, in future, I need to look out for that little spot on the wings to get in the right area for a correct id.
You do have to be careful though, there is one main confusion species which also has the 'small square-spot'; Ingrailed Clay - a very variable moth. Some forms of that species can be very similar to Small Square-spot here.
Thanks again. I'm trying to learn as I go along so the comments are really helpful.
Lat/Lng: 50.6857, -1.5262
OS grid ref: SZ335874