I (not English native) regularly write about crime cases in my area. The main source is usually a high-ranking police officer which I introduce along with the police station he works at. But in my article, I'm never sure about the correct preposition:
...said Mr Daniels, an investigator at Dungworth Police Station.
...said Mr Daniels, an investigator from Dungworth Police Station.
...said Mr Daniels, an investigator of Dungworth Police Station.
To me, some of these sound like I spoke to him at the police station itself, which in most cases is wrong. The questions are usually being asked on the scene.
What is the correct version(s) in British English?