Quite informal but like a magistrates hearing.Witnesses are called and are questioned by the coroner and,if engaged, legal representatives.
Depending in the inquest you might have doctors and or members of the Emergency services who are called to give evidence.
Rules of evidence are less stringent and, if I recall correctly, hearsay is permitted. The inquest will not sentence people but the verdict may or may not lead to further criminal investigation.
Of course inquests at Coroner's court can deal with treasure trove etc.