Competency based interview against specific criteria in the civil service competency framework. Expanding on what you have already written in your application. Normally in an pannel of 2 or 3 with someone who is same grade as the position you applied for and someone who is the grade above. They will basically be writing the entire time you talk. Not interested in anything else you have to say. Your competencies are marked out of 7. Use the ones you had for your written application. They will ask questions to try and make you say what they need. It's normally a 45 minute process.