Cheryl Grimmer: Family urges …

Three-year-old Cheryl Grimmer vanished from a beach near Wollongong in 1970.

Despite a huge police search no trace of her has ever been found, but a 2011 inquest concluded she had died.

The case against a man who allegedly admitted in 1971 to her abduction and murder collapsed in 2019.

A Supreme Court judge ruled that a confession he allegedly made as a teenager came in a police interview that did not follow guidelines for questioning minors, and could not be used as evidence.

Police have refused to say publicly if the man - who pleaded not guilty and cannot be named for legal reasons - remains a suspect.

Previous Attorney General Mark Speakman described the collapse of the 2019 trial as the "end of the road" in one of Australia's most high-profile mysteries.

"I don't want any other family to go through what our family has been through. I'm angry," Cheryl's brother Ricki told the BBC's Jon Kay at the time, for the

.

But Australian police continued to investigate, and in 2020 the NSW government increased its reward for information to A$1m (£540,000; $680,000).

Now the Grimmer family have sent a letter to Mr Speakman's successor, Michael Daley, asking him to look again at the judge's decision. The BBC has approached Mr Daley's office for comment.

In dismissing the 2019 case, Justice Robert Allan Hulme said the teenage suspect had no guardian or lawyer present during the 1971 police interview.

He described the boy as of "low average intelligence" and "more vulnerable than the average 17-year-old as a result of his disturbed upbringing".

But the Grimmer family say that decision gave no consideration to "the victim of the crime", and describe the omission of Cheryl's name from the judgement as "something that sickens the family".

"I would suggest that this sits very awkwardly against Australia's obligations under human rights instruments," says the letter signed by Michael Grimmer, Cheryl's cousin.

The family says details in the confession were "corroborated during a 2016-17 reinvestigation".

The letter calls on Mr Daley to allow an application to the NSW Supreme Court for a fresh inquest, and to lift media restrictions preventing the previous suspect's name being published to prompt other possible witnesses to come forward.

The Grimmer family had only just moved to Australia from the UK when Cheryl disappeared.

She was last seen in showers near the beach, where she had spent the afternoon with her mother and two older brothers.

Witnesses at the time reported seeing an unknown male carrying a child wrapped in a towel towards the beach car park.