Police Scotland have admitted their failings "materially contributed" to the death of a young mother.

Lamara Bell, 25, laid undiscovered in a crashed car with her partner John Yuill, 28, for three days after the incident was reported to police.

The force on Tuesday pleaded guilty to health and safety failings after the car crashed off the M9 near Stirling in July 2015.

Despite a call being made to police, it took them three days to respond.

When officers finally arrived at the scene, Mr Yuill was found to be dead and Ms Bell died four days later in hospital.

At the High Court in Edinburgh on Tuesday, the office of the Chief Constable of Police Scotland admitted that it failed to ensure that people including Mr Yuill and Ms Bell were not exposed to risks to their health and safety by failing to provide an "adequate and reliable call-handling system" between April 1, 2013 and March 1, 2016.

It also failed to ensure the system was "not vulnerable to unacceptable risks arising from human error" and to ensure that all relevant information reported by members of the public was recorded on a Police Scotland IT system so that it could be considered and a police response provided where appropriate.