Warrer said the company was being wound down and a “collective redundancy” process was under way.
The BBC understands more than 50 people are employed at the site.
One worker, who asked to remain anonymous, said: “We were called to an urgent meeting without notice.
“Employees were told in a few short sentences the Norwich office would be closing and everyone at the company is up for redundancy.”
“There were many people in tears, especially the younger female employees, who were shocked at the sudden announcement. Everyone was told they could go straight home and the chief executive opened a bar tab at Rooftop Gardens [a bar on the top floor] which had reached £3,000 by lunchtime”.
The company said lunches and beverages were consumed at the Rooftop Gardens by employees, but they did not want to confirm who picked up the tab and said their focus was on the employees and the process ahead.
Warrer said while all roles were considered at risk, no final decisions had been made and a consultation process was ongoing.
“We are actively exploring alternatives during this process,” he added.
“We recognise the uncertainty this creates for colleagues and our priority remains to engage openly and fairly with employees while we work through the consultation.”
He said the company was not able to comment further or confirm final numbers until the process had concluded.
