What are these creatures?

Discovered this horrid mass of black cretures on a nettle plant. The first photo shows better that they appear to be on top of a thick web (spider or insect?). I shall leave them alone to do their own thing, but they don't look very cuddly!



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It's all here http://www.wildlifeinsight.com/british-butterflies/small-tortoiseshell-butterfly-aglais-urticae/
The tortoiseshell butterfly overwinters as an adult ... I've seen them about since very early spring ..
The overwintered adults always look really rough. They've had a very rough time here this year with the recent weather.
A case in point for the thread about native plants