A joint meeting of Unite/CPHVA's health sector national industrial committee will take place tomorrow to agree the form action will take.
Members voted three-to-one to take part in industrial action. There was a 53% vote in favour of strike action with 45% against.
Unite/CPHVA said the action would start before Christmas but that the welfare of patients and clients would be paramount.
This year is the first of the three-year deal and is worth 2.75%. It is worth 8% in total.
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