Les, the only evidence I have is being a farmer close to the property. Those with TB around him are both organic and non-organic dairy and/or beef. The ground is obviously very similar to his neighbours (I do not know if the bedrock is closer to the surface preventing badgers digging). Having spent a good many years working with the Ministry in TB I know facts are what counts….. but it's an interesting 'coincidence' that his herd is – as the locals describe it – a TB free oasis.