Workers at a troubled clinical waste firm in North Lanarkshire have been handed redundancy notices.

Healthcare Environmental Services (HES) told staff they were being made redundant with "immediate effect".

In a letter given to employees, managing director Garry Pettigrew said it was due to circumstances "outwith our control".

About 150 people are employed at the firm's base in Shotts, and almost 400 at depots throughout the UK.

Employees had earlier been sent text messages warning them they might not be paid this week, with HES claiming its bank had refused to release funds.

They were then called to meetings on Thursday morning, where they were handed redundancy notices.

The letter said: "I write to you to inform you that your position in the company will be made redundant with immediate effect.

"I apologise that there have been no previous consultations on this matter, however there are unforeseen circumstances that have proven to be outwith our control".

The company has responsibility for disposing of clinical waste from every hospital, GP's surgery, dental practice and pharmacy in Scotland.

But it lost 17 contracts with NHS trusts in England earlier this year as a criminal inquiry was launched into a build up of waste at some of its depots.

HES has claimed its reputation was destroyed by the UK government, and said a shortage of incinerators rather than its actions was to blame for the problems.

Earlier this month the firm was also informed it would lose its NHS Scotland contract in April of next year, and subsequently said its banking facilities had been cut off.

One worker, Gary Hawthorn, speaking as he left the Shotts head office, said: "We knew it was coming, the writing has been on the wall for the past four months and they are still in denial saying it is not there fault, it is everybody else's.

"Gutted really, a lot of time and effort, a lot of overtime, expecting wages to arrive and they don't arrive, that puts our families in a position now."

Another staff member said: "I'm absolutely gutted, like everybody else we've got mortgages to pay and houses to keep."

Ahead of the meeting a HES staff member had told BBC Scotland the HES plant in Shotts was "full of pallets of waste", some of which had been there for more than three weeks, and added: "There are containers positioned outside the gates so that no one can get in."

The firm said it had made repeated requests for an urgent meeting with NHS Scotland "to ensure continuation of the service" but it had not received a response.

On 12 December National Services Scotland (NSS) said it had taken responsibility for waste from every hospital, GP surgery, dental practice and pharmacy to cope with a potential backlog of clinical waste after HSE withdrew its service.

A spokeswoman for NHS National Services Scotland (NSS) said contingency measures were in place to collect waste previously collected by HES.

She added: "The contingency plans include the provision of waste management services until the new national healthcare waste management contract commences on 1 April 2019."

A spokeswoman for the Department for Health and Social Care in England said: "Over the past few months, HES has made a number of unfounded allegations against the government which are completely untrue. The company is responsible for its own finances and complying with the permits that allowed it to safely operate within the law, but failed to do so and stockpiled waste unlawfully."

The BBC has approached HES for a comment.