"Foreign invaders with their sights on Britain's native plants and animals will be countered by a special rapid response unit, under plans announced by the government yesterday."
"The Department for Environment, Food and Rural Affairs (Defra) said non-native species such as floating pennywort and American mink damage Britain's wildlife and cost the (UK) economy some £2bn a year"--A quick Google search didn't find the study that calculated the number though.
From a Guardian article. HT: Graham Rice via IUCN's "Aliens" subscription.
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