Fireighters are set to extend their strike to eight days in an ongoing row with the Government over pensions.
The Fire Brigades Union claims the current proposals on pensions and retirement age were “unacceptable, unworkable and unrealistic.”
But the government responded by deeming the strike action as unnecessary and said firefighters have “one of the most generous pensions in the whole public sector.”
They will join a huge strike with more than one million public workers next Thursday.
Firefighters in London will start the walkout on July 14 and continue until July 21.
During the week there will be strike action from 6am-8am and again later from 5pm-7pm, apart from Friday when the later strike will be 11pm and 1am.
On the Saturday there will be walkouts from 11am-1pm and 11pm-1am, followed by a two hour strike from 5-pm-7pm on Sunday.
Matt Wrack, FBU general secretary, said: "The Government must realise that firefighters cannot accept proposals that would have such devastating consequences for their futures, their families' futures - and the future of the fire and rescue service itself.
"Three years of negotiations have come to nothing because the Government is simply unwilling to compromise or even listen to reason despite a huge amount of evidence showing their planned scheme is unworkable.
"Shorter strike periods have illustrated the strength of feeling amongst firefighters whilst limiting disruption to the fire service, the public and our members' working lives.”
Fire Minister Brandon Lewis said: “The deal being offered gives firefighters one of the most generous pensions in the whole public sector and yet the Fire Brigades Union keeps disrupting a taxpayer funded service with more unnecessary industrial action.
"The proposals put forward protect the earned rights of a higher proportion of members than any other public sector scheme. Nearly three quarters will see no change in their pension age in 2015.”
