About 21 mm wingspan. Would suggest Freyer's Pug, but it is too small according to books. Have had 3 like this all same size.
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If you were to suggest Freyer's Pug I would agree with you! Wingspan range is given as 18-26mm in The Geometrid Moths of Europe (Mironov 2003).
If you're using the Waring, Townsend and Lewington moth guide then that gives the length of one individual wing as 12-13mm, but the total wingspan doesn't necessarily equal twice the length of one wing, as it depends on how the wings are positioned and the width of the thorax.
Entomologist and biological recorder
Martin - thanks. I confess I had already been in touch with local experts and they told me the same thing (but without the reference). It has been odd that I have had one def Freyer's with 25mm wingspan ( I'll try to measure wings next time) and apparently broader wings, and then three small ones with a more swept-back resting position. I will get a hang of the variability of these eventually. The dark band across the abdomen is not always obvious.
I have kept one for an expert to do genitalia in due course.
Will add i'd as probable Freyers for Ispotters.
Jamie from Briantspuddle
Lat/Lng: 50.7, -2.3
OS grid ref: SY8193