A BBC Panorama investigation revealed allegations that two women had been raped during filming.

It follows BBC News exposing drug gangs, money laundering, immigration crime, and ghost directors linked to shop fronts.

Andrew Malkinson, who was wrongly jailed for rape, says being asked to repay legal fees is “penny-pinching”.

The UKHSA says the fourth case has links with the same wider social network as the others.

The Met Police will submit files to the CPS including possible cases of corporate manslaughter.