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Posture is not typical as this species usually rests with the wings slightly 'crumpled' which gives it the fork-tailed look that is evident in the 'other observations of angle shades' pictures. This one seems to have flattened its wings out.
I agree with Devonian's comment about the use of flash probably acounting for the washed out look.
Lat/Lng: 51.0949, 0.034
OS grid ref: TQ425348