London's 5,600 firefighters walked out on strike on October 23 after the London Fire Brigade sent them all letters of dismissal.
"It is a terrible step to have to take" says Fire Brigades Union general secretary Matt Wrack, "But London's firefighters feel it is the only step they can now take."
They are taking the action because, on 11 August, the London Fire Brigade formally began the legal process of terminating the employment contracts of 5,600 London firefighters.
"If they had not started that process, we would not be going on strike. If the dismissals are lifted now, the strike will be called off straight away" said Mr Wrack.