To sue police for £1.85m

The PIRC handed over reports on Sheku’s death in August 2015 and August 2016 but the Crown Office is yet to decide whether anyone will be charged.

A spokesman for the commissioner said: “The commissioner appreciates this has been a difficult period for the family of Mr Bayoh. At all stages throughout this independent investigation the PIRC has acted under the direction of the Lord Advocate who has ultimate responsibility for the investigation of deaths in Scotland.

“The PIRC conducted an extensive and detailed investigation into Mr Bayoh’s death. More than 500 statements were obtained by PIRC investigators who also gathered evidence from a wide range of experts, including those suggested by the Bayoh family and their legal representatives, to give a greater understanding of events leading to Mr Bayoh’s death.

“The commissioner submitted a report to the Lord Advocate in August 2015. A further report containing evidence gathered from a number of expert witnesses was submitted in August 2016 and the PIRC has undertaken any additional enquiry requested by the COPFS.”

A Police Scotland spokesperson said: “We can confirm that legal papers have been received and as such it would be inappropriate to comment further at this time.”

Sheku Bayoh, a 31-year-old gas engineer, was restrained around 7.30am on May 3 2015 and died just after 9am.