Royal Mail has said it is “disappointed” that the CWU union is to ballot for strike action.
In November the company won its legal battle to prevent a postal strike over Christmas.
“We are disappointed that the CWU has issued a timeline for a ballot of its members for industrial action.
“We stand ready to invest £1.8bn to modernise and grow in the UK. We want to reach agreement with CWU; but we cannot afford to delay this essential transformation any longer.”
It said for the nine months ended 29 December 2019 parcels volume was up 3.7% and letters revenue was down 1.5%.