Cleaners and security workers employed by ISS on the DLR will strike again from 1-3 February.
Following a solid strike on New Year's Eve, RMT is organising further action in an attempt to force ISS to adhere to its own agreed procedures for negotiating changes to working practises. The union also wants ISS to respond to its pay claim.
As well as the strike, RMT has also called action-short-of-strike from 5-10 February, in the form of a work-to-rule around risk assessments.