*Mullein To get rid of them you just need to pick them off by hand and move them to a plant that you don't mind them eating. There's usually a ton of buddleia bushes around that no one will mind getting munched. Or just enjoy them
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
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In the sticks near Peterborough
Nettles attract Red Admiral,Peacock,Small Tortoiseshell and Comma.I think there's one I've forgotten
Edd's link gives lots of nectar providing plants for the adult butterflies.
Lots and lots of UK foodplants for the caterpillars of llots and lots of butterflies here http://www.ukbutterflies.co.uk/foodplants.php
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.