The Constables' Branch Board (CBB) of the Metropolitan Police Federation is the staff association representing all 24,000 Constables in Greater London. We work for London's Metropolitan Police Constables and are responsible for their welfare and efficiency. The CBB provides interested parties such as community groups, the Mayor's office, MPs, local councillors and the business community with information and advice about policing in the capital. We are a statutory body set up under Act of Parliament in 1919.