Zayna Iman’s memory of her 40 hours in police custody comes back in flashes. What she does remember has haunted her for nearly three years.

The 39-year-old believes she was drugged and raped in her cell before being left naked and distressed on the floor, cowering under a blanket and so disorientated she urinated on herself.

Her quest for answers over what happened at Pendleton police station is subject of an IOPC investigation that has so far raised only more questions.

This is despite Zayna being handed dozens of pages of documents and police CCTV containing hour upon hour of distressing film - but, crucially, two are still missing.

Greater Manchester Police had initially told her that all cell footage had been reviewed, and there was no evidence to support her rape allegations.

Then the force told her several hours had been ‘corrupted’ and were not recoverable.

The IOPC began investigating and soon discovered the film ‘was never downloaded’, that GMP gave her false information and denied she had been strip-searched. It is now examining why.