UK supermarkets, including Asda, are imposing purchase limits on eggs due to supply disruptions from the worst bird flu outbreak in the country's history. The outbreak is causing concerns about Christmas poultry shortages, with some retailers sourcing eggs from Italy and others facing increased production costs due to the Ukraine conflict. The British Free Range Egg Producers Association has reported a significant loss of laying hens this season. Despite the outbreak, the UK's chief veterinary officer has assured that the number of birds culled so far is a small fraction of the annual total.