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Hi Günter

Ichneumon bucculentus is not common at all in the UK but I followed your lead and found a number of likely candidates. https://www.gbif.org/species/5030282

I. albiger

I. suspiciosus - https://www.bioimages.org.uk/html/Ichneumon_suspiciosus.htm

I. extensorius - https://www.bioimages.org.uk/html/Ichneumon_extensorius.htm

I. confusor - https://www.bioimages.org.uk/html/Ichneumon_confusor.htm

The hind femur and tibia are "highly enlarged" as per https://www.bioimages.org.uk/html/r170684.htm?4 this could indicate I. confusor or I. albiger - It is suggested here that males are indistinguishable - https://www.bioimages.org.uk/html/Ichneumon_albiger-confusor.htm

I think I am stuck with Inchneumon sp. :o

Thanks for your help, Gareth