Originally Posted by Surreybirder
The best I can come up with are a) a soldier-fly such as Norellisoma spinimanum and b) a beetle such as Carabus nemoralis.
Does that ring bells with anyone?
The fly is a Sciomyzidae - Tetanocera
(incidently Norellisoma spinimanum
is a dung fly not a soldier fly).
the beetle is indeed Chrysomelidae - close to Donacia
but not that genus.