Following the announcement from the Cabinet Office on the proposed changes to the Civil Service Compensation Scheme, which will take effect from January 2010, the FDA's Executive Committee has formally rejected the proposals as they do not form a basis for agreement nor for a recommendation to members.
Dave Penman, the FDA's head of operations, said: "We have started, together with the other civil service unions, to establish a case for a potential legal challenge and the timetable for any such action."
The union will be holding an open meeting in central London in September for members to air their views and find out more information. Further details will be communicated to members when finalised.
Penman added: "Together with the other unions in the Council of Civil Service Unions, we will be seeking an urgent meeting with Tessa Jowell, the new minister for the civil service, to raise our concerns about the proposals.
Penman said members have already been submitting their views to the FDA's dedicated email address at cscsfeedback@fda.org.uk.
He said: "We are currently analysing this feedback and considering how best to respond to some of the issues raised.
"It is clear from the feedback so far that despite the strong message sent out from departments to support their proposals, members recognise that the proposals are far from acceptable. We would encourage all members to continue submitting feedback, as this is invaluable in assisting us with any response we will be making to the formal consultation process."
Members are also being encouraged to take part in the Cabinet Office's formal consultation by advising the Cabinet Office directly of their views by emailing pensionspr@cabinet-office.x.gsi.gov.uk.