Unison members voted for the action after the union said the council de-recognised it. The first two strikes are scheduled for 23 April and 1 May. The union estimates around 2,500 staff will take part.
In January, councillors banned all negotiation and consultation with Unison following a social workers' pay dispute (LGC, 8 September 2001) and the union's disclosure of information regarding a senior officer's£11,500 pay hike.
The action follows a veto by chief executive David Burbage of the agreement by the Joint Secretaries of the Greater London Provincial Council to resolve the dispute and lift the ban on negotiations.