Photographs and social media accounts do not necessarily need to be fully checked in rape cases, the head of the Crown Prosecution Service has suggested.

Alison Saunders, the Director of Public Prosecutions, insisted she does not believe anyone is in jail after being wrongly convicted because of failures to disclose crucial evidence.

Ms Saunders’ insistence that the justice system is working comes after Scotland Yard launched an urgent review of approximately 30 sex cases due to go to trial after the collapse of two rape prosecutions in a week in December.

Anna Soubry, the Tory MP and former barrister, said she was “appalled” at Ms Saunders’ “ill informed comments” relating to disclosure.

The trial of Liam Allan, 22, was halted at Croydon Crown Court in December while days later another prosecution collapsed against Isaac Itiary, who was facing trial at Inner London Crown Court accused of raping a child.

Both cases involved the same investigating officer, and the detective remains on full duty in the sexual offences investigation unit, the Metropolitan Police said.

Meanwhile, a third rape trial collapsed after a failure from investigators to find key evidence on Monday.

The case against Samson Makele was halted at Snaresbrook Crown Court on Monday after his defence team unearthed key images from his mobile phone which had not previously been made available, law firm Hodge Jones and Allen said.