Looks like the ichneumonid wasp, Pimpla rufipes - or thereabouts.
Here's my reply to a posting friom last week:
This is a Ichneumon Wasp (Hymenoptera: Ichneumonidae; Pimplinae) which as a group are parasitoids of lepidoptera (butterflies and moths) larvae or pupae. This is most likely to be Pimpla rufipes, which is one of the commonest species, although there are a few near identical species. Pimplarufipes is a generalist parasitoid of moth pupae and is widespread and common in the UK. Although they look a bit fearsome they are harmless to us.