Coroners in England and Wales are appointed directly by the Crown to investigate all deaths where the cause is unknown or which might not have been due to natural causes. They are judicial office holders, in the same way as judges or magistrates, but belong to a different branch of the legal system. Many coroners are trained as lawyers, while some have a medical background.
Each senior coroner is responsible for an area; in London, this will be a number of neighboring boroughs. NW London comes under the jurisdiction of the North London coroner, who covers Brent, Barnet, Harrow, Haringey and Enfield.