Attracted to lights near deciduous woodland.
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@RHoman, I think you're right. I have another photo which shows the size as being just a fraction larger than a 1p coin (it was out of focus so I didn't upload it). The smaller size indicates that Small Fan-footed Wave is more likely.
Also, I notice in all the photos I can find, the abdomen extends much further beyond the hind-wings in SFFW than it does in Plain Wave.
Lat/Lng: 52.7, -2.8
OS grid ref: SJ5116