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Such positions are usually taken if the buyer expects the stock price to fall.

“We are confident in our ability to navigate current challenges and seize business opportunities with agility and focus,” Chief Executive Daniel Grieder said.

Back-up was drafted in from other jails to help bring the demonstrations to a peaceful conclusion, but the indiscipline highlighted major problems at Glenochil which are the subject of a new inspection report.

A 4Com spokesperson said the firm took complaints seriously, and was "extremely sorry to hear that these two customers are unhappy".

Owners of vehicles that were trapped in a London car park say they are still tens of thousands of pounds out of pocket due to the ordeal that has lasted almost three years.