You can be of any nationality to apply, providing you have the status of indefinite leave to remain and work in the UK. If you are a UK citizen, you will have this status. If you are a citizen of a country that is a member of the European Economic Area (EEA) or Switzerland, or a Commonwealth citizen or a foreign national you must be a resident in the UK and free from restrictions.
To be eligible for appointment, you must be a British citizen or a citizen of a country that is a member of the European Economic Area (EEA) or Switzerland. Commonwealth citizens and foreign nationals are also eligible but only if they are resident in the UK free of restrictions. If you are a Commonwealth citizen or other foreign national, you must provide proof that you have no restrictions on your stay in the UK. After 30 June 2021, nationals of the EEA or Switzerland will also need to provide evidence that their stay is free from restrictions.