Just watch out for the white sap ... if can cause photosensitivity if it gets on the skin and eye damage if you get it on your hands and rub your eyes.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thanks everyone. I shall get gloved up and dispose of as much as I can, and get some warning signs up. Enemy number 1 now, next to conkers and bindweed.
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Euphorbia lathyris..common name Caper spurge.
https://www.google.com/search?q=Euphorbia+lathyris&client=firefox-b&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjyubDx_IPdAhXFYlAKHRUtDNAQ_AUICigB&biw=1920&bih=943
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.