Travellers from within the Common Travel Area (Ireland, Isle of Man and Channel Islands)Members of diplomatic missions and consular posts in the UK, officers, servants or representatives of international organisations, representatives at an international or UK conference granted privileges and immunitiesRepresentatives of a foreign country or territory and representatives of the British overseas territories travelling to the UK to undertake official business with the UKDefence personnel, visiting forces and government contractors who the Ministry of Defence has confirmed are required to deliver essential defence activitiesUK officials and contractors required to work on essential border security dutiesNon-UK officials and contractors.