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It's the shoulders that are the main cluethat it is Pentatoma rufipes and not Dolycoris baccarum, aren't they?
The shoulders on Forest are the most squared of any of the regular shield bugs. The shoulders of Sloe are sloped. I'm pretty sure then that this makes the mystery bug a Forest Bug (rufipes).
Lat/Lng: 52.9704, -3.168
OS grid ref: SJ216420