?Sawfly larva on hogweed

?Sawfly larva on hogweed

Observation - ?Sawfly larva on hogweed - UK and Ireland. Description: These are making spun 'nests' in the seeding heads of the hogweed. I am not sure if they can be id to species, but maybe there is only one that goes for hogweed like this?

These are making spun 'nests' in the seeding heads of the hogweed. I am not sure if they can be id to species, but maybe there is only one that goes for hogweed like this?