Video: The bird flu outbreak in the UK - in 60 seconds A 6-mile restriction zone has been placed around the farm in Yorkshire and all 6,000 ducks on the site will be killed. A policeman stands guard at a farm near Nafferton, East Yorkshire where a strain of bird flu has been confirmed Britain last saw a case of H5N1 in birds in 2008 and, although there have been reported cases since, none have been the dangerous H5 or H7 strains. Wendy Barclay, a professor specialising in flu virology at Imperial College in London, noted that while bird flu viruses can be very dangerous for poultry, previous outbreaks of H5 strains in Britain have never infected people. South Korea culled more than 6 per cent of its poultry in March to stop the disease spreading. China and Japan have also reported cases of H5N8 this year.