Parasitic wasp

Parasitic wasp

Observation - Parasitic wasp - UK and Ireland. Description: This wasp was one of several species in a big emergence on ivy flowers. Each icy flower is about 2mm across, so it gives the scale - this 'larger' one might be 6mm long at most. Short ovipositor, very long backward held antennae. The head shape looks diff

This wasp was one of several species in a big emergence on ivy flowers. Each icy flower is about 2mm across, so it gives the scale - this 'larger' one might be 6mm long at most. Short ovipositor, very long backward held antennae. The head shape looks different to other ichneumon wasps I have seen, which have the eyes on the side 'hammerhead' style, so I wonder which family this is. Ideas?