I found this in my compost heap. It seems to be a nymph, though of what I don't know. About 15mm long.
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Thanks, Matt. So not a nymph, but a case of neoteny, perhaps?
University of Edinburgh and Biodiversity Observatory (OU)
No - not neotony. This is a fully functioning adult beetle in all respects. In this beetle family the elytra are very reduced but there is a pair if fully functional wings folded up underneath. The reduced elytra are presumed to be an adaption to to let these predatory beetles squeeze through narrow gaps, they have a "bendy body".
Tachinid Recording Scheme
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I see. Thanks.
Lat/Lng: 52.0, -0.7
OS grid ref: SP8936