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I think that the meadow brown would have only one white spot inside the black spot
I'd always thought that was distinctive, but about a year ago someone posted a MB here with a double white spot.
They do it to confuse use, I think!
Just wanted to thank Chris for the correct ID. I've changed the title of this observation so that it doesn't help to confuse anyone else. They do look very similar!
Lat/Lng: 52.7048, 0.8727
OS grid ref: TF941157