Scotland Yard has announced a ­review of all current rape and sex abuse investigations after a second trial collapsed in less than a week amid claims that police withheld crucial evidence.

Isaac Itiary, 25, had been charged with the rape of a child, but the case was thrown out on Tuesday after concerns were raised over the failure of detectives to disclose vital material to prosecutors and the defence.

Just days ago, 22-year-old Liam Allan had his case thrown out when it emerged police had failed to disclose thousands of text messages that would have proved his innocence.

It has since emerged that it was the same Scotland Yard detective who had worked on both cases. Detective Constable Mark Azariah, 37, who works on the Met’s specialist rape and sex abuse unit, is still on full active duty.

But the collapse of two cases in similar circumstances in a matter of days has prompted senior officers to launch a review of every live rape case currently being investigated by the force.