Individual Coroners decide what happens to the papers very many of them were destroyed by the coroner anyway, hence there are regional variations in survival. It is a simple enough matter to enquire at the appropriate county record office, which will almost certainly know what is available and where it is.
Under the Home Office Circular 250/1967, a schedule of destruction of coroners records is laid down. While they are within the definition of public records and open to the public after 75 years many will not have survived those 75 years. Once 15 years old the records can be weeded,' that is destroyed or sampled by the individual coroner concerned. A newspaper report is the best bet.
Stan