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Jamaican Field Cricket in Britain? I agree with John, it's a grasshopper, as indicated by it's short antennae.
BMIG website: www.bmig.org.uk (centipedes, millipedes & woodlice)
BMIG Newsletters ~ www.bmig.org.uk/view/resource/bmig-newsletter
BMIG Bulletins ~ www.bmig.org.uk/view/resource/bmig-bulletin
Lat/Lng: 52, 1
OS grid ref: TM060377
Landscape undisturbed, rural and lots of greenary.