Hoping I've got it right this time ! ??
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At least for me since I do not see these very often but if I had to choose I would go with Douglas's ID - this does not seem to have the very pinched dark band of Alder Kitten.
Yes, sorry I did mean to add an ID note but I somehow clicked 'add' first without thinking!
As you say, the inner cross band is perfectly straight on this moth - Alder Kitten has this band indented. Also much less contrast between colours overall on the moth.
(And Poplar Kitten would have a much more smooth outer cross band.)
Lat/Lng: 52.1307, -1.8597
OS grid ref: SP096480