I always find these difficult to separate - an id would be appreciated.
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Just passing on a tip someone else gave me to help separate these two species:
"The trick to these two is to ignore all markings except the cross-lines, particularly the middle two. the outer of the two on Mottled Beauty is is W shaped, whereas on Willow it is more tick shaped."
Once you have your eye in they are quite easy to id, assuming they are not worn!
Thanks very much for that advice! I hope to put it to use and get my id's re these two a little more accurate !!
Lat/Lng: 52.1307, -1.8597
OS grid ref: SP096480