5mm to 10mm long with flatish apprearance.
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Thanks for the ID David and the site. I Had considered Chinchbugs but it seemed way out of its range. It appears to be spreading in my direction from what the site says.
My pleasure. It's interesting to monitor the spread of these species, according to the NBN map it's halfway up the UK now.
Lat/Lng: 53.558481, -2.181017
OS grid ref: SD881068