A HISTORIC six-week strike by outsourced security guards fighting for racial justice at Great Ormond Street Hospital (GOSH) is back on, the United Voices of the World (UVW) has confirmed.

The industrial action, which could become the longest in NHS history, was originally postponed last week after the union said bosses at London’s world-famous children’s hospital were considering improvements to working conditions.

The predominantly black and ethnic minority workers, who will now walk out from Wednesday, are demanding the same pay and working conditions as their directly employed colleagues, who are majority white.

The guards are employed by Carlisle Support Services, which is owned by billionaire Tory Party donor Lord Ashcroft.

It generated revenues of £65 million and a profit of £6m in 2019, according to UVW.

The union also confirmed on Wednesday evening that 83 cleaners, who are also mostly black, are suing the hospital for indirect racial discrimination.

The workers, who were brought in-house last August after under-pressure bosses ditched private contractor OCS Group UK Ltd, are also calling for the same pay and conditions as their white colleagues.

UVW general secretary Petros Elia described their treatment as “immoral.”

He said: “If we are successful this legal case will be a permanent stain on the already tarnished reputation of GOSH.

“And it should also send a strong message to other NHS trusts that if you outsource your workers and don’t give them NHS contracts, then we’ll be coming for you in the courts and on the picket line.”

A hospital spokesperson claimed that it is currently working to bring the “multiple sets of terms and conditions” of its workers in line with the organisation’s frameworks.

“We are committed to full-scale harmonisation of terms and conditions across all areas,” the spokesperson said.