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I did not wait long enough for it to load.
P. bidens has real sharp points, not the squared-off shoulders of P. rufipes. See http://www.hbrg.org.uk/SotM/Shieldbugs.html.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 51.5678, -4.1187
OS grid ref: SS532875
Several on wet sand after the tide had gone out