LONDON (Reuters) – A mandatory housing order for poultry and captive birds in Britain is to be lifted, effective May 2, with the threat of bird flu now decreasing after the country’s worst-ever outbreak. The four Chief Veterinary Officers, with responsibilities for England, Scotland, Wales and Northern Ireland, announced the move in a joint statement on Monday, opening the way for the production of free range eggs to resume. On Nov. 29, Britain made it a legal requirement for all bird keepers across the United Kingdom to keep birds indoors. European Union rules, which Britain still follows, al…