Phosphine is a vitally important fumigant used in the UK for the control of burrow living vertebrates (rabbits, rats and moles) and a wide range of invertebrate pests which infest stored food commodities. Phosphine’s high acute inhalation toxicity makes it the most toxic substance used for controlling pests in the UK and,as such, deserves special attention to protect and non-target animals from irresponsible and/or ill-informed use,storage,transport and disposal.