Ophion minutus

I used Gavin Broad's key to nocturnal Ichneumonidae to identify this and it keyed very easily (for an Ichneumon).

Ophion minutus showing rightwings, first metasomal segment, mandibles and forewing-length, Wendling Beck Environment Project (Norfolk, UK), 7th May 2023

Since then I've had lots of what look like this species in my garden moth trap including up to 5 in a night. I haven't retained most for keying so am not completely certain there isn't another superficially similar small yellow-striped testaceous ichneumon I could confuse them with, and therefore haven't recorded most of them as certain. These two, however, I did key out properly. One had less clear yellow markings than the other, but they looked clearer than they do in the photo (the third photo) here. This one was also marginally larger, but very clearly within the given limits for minutus.

2x Ophion minutus, North Elmham (Norfolk, UK), 8th May 2023

Ophion minutus showing discosubmarginal cell of forewing, Wendling Beck Environment Project (Norfolk, UK), 14th May 2023

2x Ophion minutus, Wendling Beck Environment Project (Norfolk, UK), 23rd May 2023