Two men have admitted conspiring with a convicted murderer to spring him from custody during a hospital visit in a plan foiled by police.

Officers covertly set up audio and video surveillance when they discovered the plot to help Robert Paterson escape from custody, and intercepted.

John Wilson, 29, Scott McAllister, 39, and Paterson, 32, admitted conspiring, between January 12 and January 17, to defeat the ends of justice and help Paterson escape from from HMP Shotts while on a pre-arranged visit to Wishaw General Hospital.

The trio pled guilty when they appeared before Lord Bracadale at the High Court in Glasgow.

Wilson and McAllister admitted visiting the hospital grounds to establish a way for Paterson to escape and left a car there with the keys and a phone inside.

Advocate Depute Jonathan Brodie, QC, told the court: "Mr Paterson is a keen footballer but has a long-standing knee injury which requires treatment at Wishaw Hospital. The accused knew he was to have an appointment and, using phone communication with Mr Paterson in prison, began to discuss plans for an escape from the hospital grounds.

"The plan became known to police at an early stage and was intercepted.

"It's doubtful whether the plan could be realised."

They will be sentenced today at the High Court in Glasgow.