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Your pics have Thunderworms ( Mermis sp. -white threads )
writhing amongst the flower trusses. A parasite of leaf eating insects.
It is really important to add photo's of the leaves to as this makes it easier to give a correct id as some seed,flower heads can look very similar also close up photo's and size too.
many thanks Brock,I would have put those down to contact with a hairy dog !
Will keep an eye out for them in future...george
Lat/Lng: 56.0464, -4.7246
OS grid ref: NS303870