In a letter to Royal Mail’s chief executive Adam Crozier, the CWU’s deputy general secretary Dave Ward said the union remained “committed to reaching an agreement”.
The CWU has made it clear it will not discuss Royal Mail’s previous offer as that had been overwhelmingly rejected by the workforce in a strike ballot.
“I have told [McCarthy] that we expect fresh and meaningful negotiations. We are not in the market for Royal Mail simply rehashing its previous position or deliberately stringing out talks,” Ward wrote.
The CWU’s postal executive is due to meet on Thursday 21 June to reassess its position.
If a nationwide postal strike does go ahead, it would be the first since 1996.