According to a BBC report, the accident took place at the Childerditch Industrial Park in Brentwood, Essex, at 11am on 25 September.

A spokesman for the Essex County Fire & Rescue Service said that firefighters had assisted in moving the man from the rear of a lorry parked at Unit 51 on the estate to an air ambulance.

The man, who was said by the BBC to have suffered "multiple injuries", was then airlifted to Victoria Park and transferred to the major trauma centre at Royal London Hospital.

A spokesman for the Health & Safety Executive confirmed that it was investigating the incident.

Units 51-52 house the production and warehousing facilities for UK paper converter and flexographic print business Aspenlink, which supplies coated and uncoated graphic and magazine papers and prints giftwrap and other specialist products.

The 2,800sqm facility houses Jagenbeg Vari-Dur and Masson Scott U1A slitter rewinding machines with trim widths up to 2,850mm, and a 1,420mm CMF Flexographic printing machine. The warehouse has a total capacity of 4,000 tonnes, while the firm's clamp trucks can handle reels up to six tonnes with a diameter of 1,800mm.

Aspenlink was unavailable for comment at the time of writing.