A kidnap victim was tortured with searing hot knives and told he would be killed unless his father paid his captors £18,000.

David Morrin was abducted from his family home in Netherburn, South Lanarkshire, and held hostage for almost 24 hours.

The captors called the victim's father, David Morrin Snr, several times and eventually put his son on the line in a bid to extort money.

Terrified Mr Morrin Jnr begged: "Dad, do this or they will kill me."

Mr Morrin Snr agreed to stump up more than £3000 before armed police swooped on the flat in Possil, Glasgow, where his boy was being held.

It eventually led to the arrests of thugs Gary Roxburgh and Zak Bennett.

The pair, both 26, are now behind bars after they admitted a charge of assault and abduction at the High Court in Glasgow.

The indictment stated Roxburgh also extorted money from Mr Morrin Snr.

The duo will learn their fate in the new year.

The High Court in Glasgow heard Mr Morrin Jnr had a free house on June 19 as his parents were away.

During the course of the night he was joined by the accused and his friend Craig Johnstone.

Mr Morrin Jnr had known Roxburgh for around two years.

The men were all in good spirits but, at about 4am, Bennett suddenly asked: "Are we ready to leave?"

Roxburgh, wearing bright gardening gloves, stood up in the kitchen and brandished what appeared to be a handgun.

Bennett was then seen armed with a knife in each hand.

Roxburgh initially ordered Mr Morrin Jnr and Mr Johnstone to bound their own feet and ankles together with ties and cord.

Mr Morrin Jnr was then told to tie his friend's hands with a shoelace.

Prosecutor Maryam Labaki said: "Roxburgh removed Morrin jnr from the room.

"At that time, Bennett stated to Johnstone: 'We've been told that you set us up'.

"He approached Johnstone and held one of the knives to Johnstone's neck."

Roxburgh demanded from both victims: "I want to know the truth."

Ms Labaki: "He turned on the gas cooker rings and laid the knives on top while making threats to burn their faces."

Roxburgh then pressed one of the heated blades on Mr Morrin Jnr's leg and arm.

He was also struck with the handle of a gun as he was pulled from the house.

Mr Johnstone was left alone with the house being locked but managed to free himself and call his girlfriend for help.

Meanwhile, Mr Morrin Jnr was shoved in the boot of a car, dragged out at an unknown location and then driven to a flat in Possil, Glasgow.

It was there Roxburgh ordered Mr Morrin Jnr to call his father.

He told his father he was "OK" but he had been "burnt".

Later that morning Mr Morrin Snr received a call from Mr Morrin Jnr's mobile.

Ms Labaki said: "Morrin Snr spoke to a male with a local accent who stated that his son owed him £18,000 and that they had taken him from his home address.

"The male said if they did not receive funds they would cause serious harm to Morrin jnr and that they would kill him."

Mr Morrin Snr panicked and called police.

During the course of the day he received more calls from a number of men who were acting as "brokers".

Around 10pm, Roxburgh let Mr Morrin Jnr talk to his father.

The desperate son stated: "Dad, do this or they will kill me."

Mr Morrin Snr agreed to stump up £3450 which he believed would allow for "the safe release of his son".

A cash handover took place at services on the M74 in Hamilton, South Lanarkshire, and an individual returned to the Possil flat with the money.

Ms Labaki said: "Morrin Snr received a call from Roxburgh in which he was thanked for his instalment.

"But, he was advised that his son would not be released until the balance was paid."

The man who collected the cash left the flat with others in the early hours but their car was halted by armed police as the hunt for Mr Morrin Jnr was stepped up.

At 2.25am on June 20, firearms officers stormed the flat where he was being held.

A "disorientated" Mr Morrin Jnr was discovered on a sofa with burn marks to his arms and legs.

He was taken to hospital and transferred to a specialist burns unit.

The victim later identified Roxburgh to police.

Armed officers swooped on his home in Milton, Glasgow, days later. He spotted them and leapt from a first floor window - but broke both heels.

He had £757 cash on him and some of the notes matched those handed over by Mr Morrin Snr.

Bennett, of Wishaw, Lanarkshire, was also traced.

Mr Morrin Jnr was shown his social media photo and picked him out as the driver who came to his home. It was not until late July he was held.

He admitted being at the Morrin house but insisted it was because he had been "threatened by an unnamed male" with a gun.

The court heard DNA also linked both Roxburgh and Bennett to the crime.

The pair pleaded guilty at the High Court last week but the facts were narrated at a separate hearing.

Judge Lord Mulholland adjourned sentencing for reports.