Various Ichneumon Wasps

Ichneumon Wasps generally have slender abdomens and long antennae. The females are parasites and typically have long ovipositors to lay eggs in nesting holes or bodies of host species.

Apechthis compunctor ichneumon wasp
Apechthis compunctor wasp
Apechthis compunctor ichneumon wasp
This Ichneumon Wasp is thought to be Apechthis compunctor but there are several similar-looking ichneumons. First two in Hertfordshire and last one in NW London garden.
Casinaria ichneumon wasp
Casinaria ichneumon wasp
Casinaria ichneumon wasp
This Ichneumon, on hogweed in NW London, is believed to be a Casinaria species.
Coelichneumon sinister ichneumon wasp
Coelichneumon sinister ichneumon wasp
Coelichneumon sinister ichneumon wasp
This black Ichneumon with white patches on its antennae and "scutellum" (back of thorax) is thought to be Coelichneumon sinister, but again there are several similar species.