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It looks like a noctuid moth caterpillar- a trawl through the images in ukleps may turn up its likeness. Its a bit like their green example of Large Yellow Underwing but there may be other possibilities. More angles might help bring it to species? Eg a dorsal view?
Edit-Sorry Belfasthillspartnership, I had your initials wrong first time round.
Lat/Lng: 54.5857697, -6.0372502
OS grid ref: NW392286
Found in wet open grassland 15m from edge of Sitka Spruce plantation, but also near sparse deciduous natives, including Birch and Beech.