A college where a teacher died of Covid advised staff to break the pandemic rules and even held a Christmas party for all staff, a new report said.
Burnley College has become the first educational establishment found by the Health and Safety Executive (HSE) to have to breached health & safety laws during the pandemic.
The report followed an HSE investigation into the death of Donna Coleman, 42, in January last year.
The findings showed the college failed to "meet social distancing and ventilation requirements" in an office that Donna shared with two colleagues - even after one tested positive.
And staff at the further education college were encouraged not to report their "close contacts" if they caught Covid.
It confirmed that a Christmas party "for all staff" was held when there was a strict ban on gatherings - on the same day as the infamous Downing Street bash.
Footage of the party later emerged showing a staff member breaking into a karaoke rendition of "It's Raining Men" in front of an assembled cheering crowd.
The University and College Union, which supported Donna's family in bringing the case, said the school had "endangered the lives of staff and students".
General secretary Jo Grady said: "The Health and Safety Executive has found numerous instances where Burnley College failed in its duties to protect the safety of its staff and students during the deadly second wave of Covid.
"Whilst the HSE was not able to find that Burnley's failings directly caused Donna's death, it is clear that the college endangered the lives of staff and students.
"The college should not need a year-long investigation to address basic failings like refusing to allow staff to self-isolate when it was a legal requirement or to realise that it is incredibly reckless to push ahead with a Christmas party during a pandemic.
"Many workers have lost their lives to Covid and today our thoughts remain firmly with Donna's family."
Stephanie Coleman, 39, Donna's sister said that programme leader Donna had raised concerns about her safety as students returned to the college in September, 2020.
She said: "She was asked to go back to do some claims, so she did, as there was only her and another person in the office.
"At that point, she said there was nothing in place, but it was kind of okay as she'd brought her own mask and taken her own hand sanitiser in. But in September, 100% of staff and a 100% of students back.
"She told me: 'There's 15 of us in our staff room, and there's no social distancing going on."
Stephanie claimed that at the time there was a culture of denial about Covid at the college, with staff often commenting that it didn't exist within its premises.
She said: "The line was "well, Covid doesn't exist at Burnley college - do you not know?"
"But Burnley had one of the highest rates in the country."
Stephanie urged her sister to complain, but Donna said that she was afraid of losing her job.
She said: "We spoke daily. We were very, very close, and she said, "Steph, I'm frightened for my job, I can't afford not to be in."
Stephanie said her sister began to feel unwell during the second week of December, 2020, as more and more cases began to emerge at the college.
She said: "On Friday, December, 11, she felt poorly. I was in Lanzarote at the time, and I'd not seen her for two weeks as I didn't want any contact before going away.
"I said: 'Are you alright, it's Friday!' She said, 'I just don't feel that great.' She said: 'I think I'm just tired, it's been a busy week'.
"Two people from her office tested positive over that weekend, so then she went for a test.
Donna tested positive for Covid on December 14, during a week when at least 14 other staff members from the college also went down with the virus.
But despite the outbreak in positive cases, Stephanie, who previously worked at the college, claims that bosses arranged a Christmas party for staff, flouting Covid regulations.
She added: "I heard about the Christmas party, and I knew it was happening. It was notorious every year.
"They might have slightly adapted it during the day, but they still provided everybody with a couple of drinks of alcohol each and food separately.
She added: "People are at home poorly - we all want Christmas parties, but you don't do it.
"You're a massive college in the centre of town. The rules at the time are that you don't do it - so why are you?"
Donna was taken into hospital suffering from Covid on December 28, and passed away on January 6, 2021.
Stephanie says she felt like the college failed in their duty of care towards her sister and didn't take her health concerns seriously.
She said: "It was like 'we're a bubble that's exempt from it because we're carrying on as business as usual', when everybody else in the country - well, most other people in the country - were following the rules."