Postal workers at a Royal Mail depot in Bristol held a meeting this morning, and will be sent ballot papers to decide if they will go on strike.
Workers at the Mead Street office in Bedminster say they've ended up with a backlog of deliveries.
Royal Mail blamed high levels of sickness for the backlog.
David Wilshire from the Communication Workers Union (CWU) says the Christmas post could be affected:
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Mayor Marvin Rees has begun a campaign to find 25 homes for Syrian families in December, representing one for every day up to Christmas.
The cloud takes total control during tonight. For most its a dry night. A lot of cloud but also some sunshine at times.
We may have seen the last of the very cold nights. Moving into a milder regime tonight. Thats reflected across the weekend.