The IMF says the UK economy is forecast to shrink by 0.6% this year.
Under the bill some employees would have to work during strikes - and could be sacked if they refuse.
The Royal Navy cedes control, as the home secretary warns small boats could cost the Tories the election.
The Fire Brigades Union says it will not announce dates for 10 days so employers can table an improved offer.
Talks between Education Secretary Gillian Keegan and union chiefs have proved "unproductive".