Postal workers in the county could refuse to deliver competitors’ mail after union members voted to oppose privatisation.

Chad Croom, from the Oxfordshire branch of the Communication Workers Union, said: “A boycott could be the next thing, but we’ll have to wait and see.”

He said no date for action had been agreed.

Royal Mail spokesman Akudo Ike said: “Royal Mail is committed to seeking an agreement with the union on the way forward.”