The pressure is to decide against prosecutions. Many would want to know why, if the CPS had the temerity to prosecute their colleagues. Some families then hope an inquest will provide the forum where the truth will emerge. However the inquest has a very narrow remit concerned with the medical cause of death and not who was responsible. Officers do not have to answer questions that may incriminate them.
Coroners are variable in quality.
And most will not allow a broad-ranging inquiry. The police force is represented by a team of publicly-funded lawyers while the Police Federation funds individual officers. The family has no access to public funding as of right. The director of public prosecutions has decided not to prosecute any of the officers who detained Roger Sylvester. The high court refused to order him to hand over to the family documents from the police investigation into his death.