Civil service interviews follow a very specific guidelines. You need to ensure that you answer the technical questions then you have the behaviour questions that need to be answered in the star method.
I applied online. I interviewed at UK Export Finance
Interview
A take home task was required, which was related to the role and a particular customer segment. Additionally a presentation was needed on a topic of choice.
The team were unstructured in their approach during the interview, and the competency questions were not particularly relevant to the role.
I interviewed at UK Export Finance (London, England)
Interview
Panel of 2 asking university exam questions with no chance to expand on answers or allow any of my own questions. Not sure they knew what they were looking for.