Due to the risk of avian influenza, new housing measures to protect poultry and captive birds will come into force on 14 December in England, Scotland and Wales. It will be a legal requirement for all bird keepers to keep their birds indoors and to follow strict biosecurity measures.

More at GOV.​UK: https://www.gov.uk/government/news/avian-influenza-bird-flu-national-prevention-zone-declared