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MPs will debate the use of organophosphates today, with some calling for a full public inquiry to be held. The chemical has been linked to chronic illness in some farmers, after its use was made mandatory in the 1970s and 80s to combat sheep scab. We hear from one farmer who says it took several years to get a diagnosis after he was exposed to organophosphate sheep dip since the age of 17.

The National Trust has published results of a badger vaccination trial on one of its estates. It was a four year programme which the charity hoped would show that vaccination could be carried out cost-effectively on a large scale, to tackle bovine TB in badgers. The Trust says the cost per badger worked out at around 拢240 once the cost of the vaccine itself, plus transport and staffing costs, were taken into account.

And we hear from the Biotechnology and Biological Sciences Research Council - BBSRC - whose scientists are working to increase yields of crops to meet a growing global demand for food.

Presented by Anna Hill and produced by Sally Challoner.