The MP with responsibility for the fire service has said the current round of strike action is "damaging".
Penny Mordaunt is the Chief Fire and Rescue Adviser in the Department for Communities and Local Government.
In a letter to the Fire Brigades Union published on the Government's website and dated 7th August, Ms Mordaunt said she would be happy to meet with union representatives if they called off "further damaging industrial action."
In a previous letter to Andy Dark, Assistant General Secretary of the FBU, dated 6th August, she wrote: "The public may rest assured that business continuity and resilience measures have been and will remain in place. But this takes place at a cost to the public purse; to the income of striking firefighters, but also to those who protect their communities during strike action. I know you appreciate that the strain on colleagues who remain at their posts is considerable, and that strike action is both unnecessary and counterproductive."
She ended the letter by saying: "I hope that you will reconsider your decision and call off this reckless and unnecessary action."
More top news
The strikebreakers would provide a "pool of relief staff" so the city could still operate during the Tube strikes.
Dean Waite's prints of London icons are made with little more than a biro.
Ahead of tonight's planned strike, London Underground have offered new payments and terms to staff to avert the strike.