The Government said it was "disappointing" that the PCS union is planning three months of industrial action, including a huge strike on Budget day.
A Cabinet Office spokesman said: "It is disappointing that, yet again, the PCS insist on pushing for futile action which benefits no-one, and damages the services they deliver to the public."
More top news
Two bodies found in the Himalayas have been identified as Alex Lowe and David Bridges - 16 years after they went missing.
British troops have arrived in war-torn Somalia in a bid to tackle the threat from Islamists militants.
The first US cruise ship to Cuba for over 40 years has set sail from Miami.