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What are these caterpillars on my stocks??

Hi all, it's my first year growing stocks from seeds. They are now decent sized plants but I just noticed these millions of small caterpillars on one of them! What are they and how do I get rid of them please....? Warning: Disturbing picture below


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Pick them off and put them on the bird table or in a compost bin or …
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.