I understand, as do all hon. Members, the traumatic impact that bovine TB has on farmers with affected stock. The gamma interferon test is a valuable addition to our armoury in attempting to deal with this disease. The skin test and the gamma interferon test have different qualities and it is right that we should use the latter alongside the former. It is not always the case that lesions can be found post mortem, but that does not mean that the animals do not have TB. There is a difference in the specificity and the sensitivity of the two tests. I have looked carefully at the issue and I think that the gamma interferon test should be part of the armoury, but I understand completely farmers' feelings when apparently healthy animals are culled.