Staff at Citizens Advice have voted to go on strike in a dispute over new contracts.
Members of the trade union Amicus voted 84 to 63 in favour of strike action and a larger majority voted for industrial action short of a strike.
The dispute hinges on changes to redundancy levels, holidays and sick leave in new contracts which have been offered to existing staff but made mandatory for new staff.
Chris Ball, national voluntary sector secretary with Amicus said he wanted a "meeting of minds" with management over the issue.
But Simon Bottery, director of communications at Citizens Advice, said the charity would not budge. "We regard this as a technical mandate for strike action, not a moral one, as more members have accepted the new contracts than voted to strike," he said.