Human remains from NHS patients were stored in unrefrigerated containers for more than six months by a scandal-hit waste firm, according to inspection reports detailing a “powerful odour of decaying flesh”.

Healthcare Environmental Services made headlines last year after it allowed a stockpile of hundreds of tonnes of clinical waste, including amputated body parts and organs, to build up.

The company had previously denied that any of the waste it had accumulated had been stored inappropriately and blamed a lack of incinerator capacity.

But reports from Environment Agency inspections, before news of the stockpiles broke, show basic failings, including leaking containers and drainage systems, waste stored in full sun and piles of hazardous waste mixed together.

Copies of reports seen by the Health Service Journal, which originally broke news of the stockpile, include accounts from EA officer Alan Johnston on an inspection of the company’s Normanton site in Yorkshire.

Upon opening the doors to the site’s faulty refrigeration unit, used for anatomical waste, Mr Johnston wrote he was met with “such a strong powerful odour of decaying flesh mixed with a highly intense chemical odour of disinfectant that I was unable to stay in the entrance to the unit for more than a few seconds”.

The refuse included two containers that had been at the site for more than six months and another bucket leaking what appeared to be blood.

Red-lidded containers used for human remains were not stored in refrigerated units and some were leaking what appears to be blood (Environment Agency/ HSJ) ( Environment Agency / HSJ )

Despite being in the middle of the heatwave, inspectors found human and surgical waste being stored outside the warehouse, in “full sun and under black shrink wrap despite the prolonged and extreme high temperatures that the country [was] experiencing”.

At the time of the inspection, the EA estimated more than 356 tonnes of waste was stored at Normanton, despite it only being licensed to store 70 tonnes.

Pictures show containers of toxic, clinical and anatomical waste, which are meant to be stored separately, dumped in overflowing piles at the site.

Healthcare Environment Services revealed before Christmas it would be going into administration and had made staff redundant, although criminal investigations are still under way.

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A company statement released in October when the revelations came to light said only 1 per cent of the waste it collected was anatomical.

“Anatomical waste is not stored on any of our facilities for longer than is allowed by permitted guidelines,” it added.

“All clinical waste is correctly stored, with anatomical waste kept in refrigerated units and not stored or driven around in vehicles, as has been claimed.”

An EA spokesman said: “HES has significantly and repeatedly breached its environmental permits by storing excess waste inappropriately at a number of its sites.

“In addition to our enforcement activity to clear the sites, we are undertaking a criminal investigation.”