This required a change of attitude on the part of the six dairies (known as the Stilton Cheesemakers' Association) that make blue Stilton. After Colston Bassett Dairy switched to pasteurisation, the dairies had lobbied to ensure the PDO specifications stated that Stilton was made of pasteurised milk only. They argued that there were health and hygiene issues in the use of unpasteurised milk, which Mr Hodgson and Mr Schneider have refuted.