Serco-employed workers at Bart's Health NHS Trust will strike again on 18-22, 25-29 August, and 1-5, 8-12, and 15-19 September.
Workers have so far stuck for 22 days, including a two week strike from 25 July to 7 August, in their fight over low pay. Serco is still refusing to negotiate with the workers' union Unite.
They are demanding a 30p per hour increase, and for lower workloads.
One worker, speaking to Workers' Liberty activists, said that "Serco thinks they can get away with treating us with disrespect, but they can't get away with it, it is not fair. We will carry on fighting."
On 3 August workers protested at Serco's shareholders meeting, before being joined for a joint protest with striking British Airways Mixed Fleet cabin crew and strikers from the Bank of England.
• Watch our video of the strike on Facebook.
• Send a message of solidarity to firstname.lastname@example.org and email@example.com.
Make a donation: By bank transfer: account 20344885 Sort code 60-83-01 or cheques payable to "Barts NHS Health Branch" to Unite the Union, 33-37 Moreland St, EC1V 8BB.