Ephialtes manifestator

An entirely black species with orange legs.  The female has an extremely long ovipositor (up to 6 cm) for probing the nest of solitary bees and wasps, together with the wide, pale brown clypeus on the lower face. Males are not as conspicuous, but can be recognised among many similar, mostly black ichneumonids by a fringe of long, curved hairs along the leading edge of the forewing, together with a wide, pale brown clypeus. 

Can be confused with species of Dolichomitus and various Pimplinae.

Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.

Hedgerows and woodland areas.

Flight period May to September.

Hosts are the pupae of solitary bees and wasps. Often reared from bee hotels.

True status is difficult to determine due to lack of records, but seems to be widespread in the southern half of Britain.

Status in Leicestershire and Rutland not known.