RLX's software balances the processing load among hundreds of blades and instantly shifts data and workload from a failing blade to a reserve unit.

FORBES: Attack From Below

But inspectors from the health watchdog found that the unit was "still failing to comply with national regulations on staffing".

BBC: Bristol

He said his relationship with Ms Casburn was "cordial", but she had accused him of failing to support her and the unit on one or two occasions.

BBC: Detective April Casburn 'offered NoW leaks for cash'

The watchdog said Southwark Sapphire unit's approach of "failing to believe victims" was "wholly inappropriate".

BBC: Met Police's Sapphire rape units face shake-up

Marta Dominguez, head of a police unit for female victims in the city of Niteroi was replaced for failing to investigate that case properly, while Martha Pereira, an investigator in nearby Sao Goncalo, was ousted for not helping the Brazilian victim fast enough.

WSJ: Rio Police Arrest Third Suspect in Rape of U.S. Woman

The figures for these underperforming schools were revealed by the head of the government's unit for raising standards in education, Michael Barber, at a conference in the United States on failing schools.

BBC: Hundreds of schools 'failing'