The Fire Brigades' Union has confirmed this afternoon that a strike will go ahead tomorrow.
The one hour strike will start at four and five o'clock in the morning. But normal services will resume for the Olympic Torch Relay in the area later in the morning.
Talks to reach a settlement between fire chiefs and unions in Essex have failed.
The conciliation service Acas met with both sides yesterday over threats of strike action over changes to working practices. At the moment the first walk out will take place on Thursday.