The categories of interested persons are set out in section 47 of the Coroner’s and justice Act 2009.  Please see the following link for the detailed guidelines: Coroners and Justice Act 2009

The coroner decides who will be given interested person status. 

Rights of interested persons, including bereaved people;
Interested persons involved in an inquest have the following rights:
– to be told the date, time and place of an inquest if one is needed.
– to ask relevant questions of witnesses at the inquest, either in person or by a legally qualified representative.

Bereaved people may also:
– ask the coroner, via the funeral director, for reasonable access to see the body before it is released for the funeral.
– ask the coroner for a copy of the post mortem examination report or to arrange for it to be seen free of charge.
– ask the coroner about a separate post mortem examination.  The cost of this examination, including any fee of the registered medical practitioner and mortuary charges, would be self-funded.