Queen Elizabeth II looks at a model of the RMS Queen Mary 2 transatlantic ocean liner during a visit to the International Maritime Organisation (IMO) in London yesterday to mark the 70th anniversary of its formation. As a specialised agency of the United Nations, the IMO is the global standard-setting authority for the safety, security and environmental performance of international shipping. The organisation has 173 member states and is the only United Nations agency to be headquartered in the UK.