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Found 1st July 2012 in grassland near the river Nene about 10cm above the ground. Clinging motionless head towards the ground in the morning sun. Possibly newly emerged? Did not move when grass stem was touched. Only example seen. 3-4cm long.
This looks to me like Cimbex luteus the Giant Sawfly. It's quite harmless and rare, I think there is a national reporting scheme for them but I don't have the address off hand.
Best wishes Lewis
Thank you so much!