This was found on a cardboard box inside a disused commercial greenhouse.
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The thing in the middle is clearly a dead caterpillar and the black objects all around are the the pupae of parasites that have emerged from it. Someone may be able to identify these for you more precisely. It is a very interesting observation. If you still have the box, take another look at it. Eventually the pupae will hatch and it would be great to add a photo of what emerges to this observation.
University of Edinburgh and Biodiversity Observatory (OU)
I'd be intersted to see what these things are too. They do not look like Tachinid fly puparia, too much of an "odd" shape and segmented, and I would usually expect parasitic Hymenoptera to have spun a cocoon. If anything, these look more like beetle pupae, but I'm not really sure of what they will hatch into.
Let us know and, if possible, keep a specimen or two.
Tachinid Recording Scheme
TRS Facebook Page
Really fascinated by this one...are you still on the case, Matt?
Thanks, David, for clearing this one up! (And for the other determinations recently made)
Pleased to be able to help. Will you rear them through?
Lat/Lng: 50.51356, -3.56409
OS grid ref: SX891693
Inside a large greenhouse used for storage.