Originally from: mona parr
                        
http://www.defra.gov.uk/animalh/diseases/notifiable/disease/tb.htm
EXTRACT
TB in cattle has been subject in GB to a compulsory eradication programme since 1950. There are two main elements of this programme:
routine free tuberculin skin testing of cattle herds (except beef fattening units) carried out by the State Veterinary Service (SVS) every 1 to 4 years depending on the local incidence of TB
routine post-mortem meat inspection by the Meat Hygiene Service of all cattle carcases, followed by tracing back to the farm of origin of those with TB lesions

Strange isnt it!!!