Staff at four London hospitals gathered in pickets on Wednesday morning as they launched a major cleaner's strike.
Hundreds of cleaners, porters, catering and security staff, employed by Serco on between £9.75 and £10.80 per hour, are insisting on a 30p wage increase to keep pace with the increasing costs of living in the capital.
Serco has pledged that services at Whipps Cross University Hospital, the Royal London, St Bartholomew’s Hospital and Mile End Hospital will not be hit despite the walkout of several hundred staff on Tuesday.
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However activists tweeted images of dirty toilets at Mile End Hospital on Wednesday.
Domestic workers, whose jobs entail keeping hospitals clean as well as feeding patients and moving beds, say that since Serco won a £600 million contract with Barts Health NHS Trust last year, they have been harder pressed while wages have stagnated.
Worker Margaret Acheampomaa wrote for the Independent that cleaners are now expected to perform 57 tasks per shift from mopping to high dusting, while colleagues began to suffer tendonitis, aching joints and ganglion cysts.
"I have frequently seen colleagues, grown men and women, break down into tears," she wrote.