Keep in mind Britain had the first known outbreak of mad-cow disease so they have good reason to be concerned about farm animals being fed all sorts of weird things. The article mentions the concern about feeding poultry the meat of birds from other countries where the avian flu is a problem.
They think mad cow disease started because the British farmers started feeding bone meal to their cattle, it is NOT a disease that should infect herbavores. Apparently cattle farmers in the U.K. were buying bone meal from places like India, in India people were scavenging bones from any available source and it is believed that the bones of humans carrying the brain disease (since dead humans are burned and then often dumped into the rivers) were mixed in with the bone meal fed to British cattle and that is what introduced mad cow disease.