A spokesman from Essex Police, said: "We were called to reports of a man injured outside Unit 7 at around 2.30am on Sunday 30 May.
"It was reported the man, who is in his 20s, had been assaulted and had sustained a serious head injury.
"Anyone who has any information about the incident is asked to contact us on 101 quoting the crime reference number 42/101344/21.
"You can submit a report online at https://www.essex.police.uk or use the 'Live Chat' button to speak to an online operator between 7am-11pm.
"Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111."
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