Disgruntled Royal Mail workers last night decided to ballot for strike action at a delivery office in a move that may affect Christmas post.

The 115 employees at the depot in Bridgwater are angry about changes to staffing levels which they say will result in mail arriving later in the day.

David Wilshire, of the Communication Workers Union said, the row had been sparked by the firm's recent decision to replace three full-time workers with part-timers.

He said: "This means more work for the other employees and it delays the post getting out to the customers."

It will take three weeks to hold the ballot but if there is a Yes vote the workers could go on strike before Christmas.