Eleven delivery offices in Scotland are affected by the industrial action — including three in Fife and the central processing and distribution centre in Edinburgh — prompting fears mail deliveries in Dundee will be disrupted.

However a Royal Mail spokeswoman said today the walk-out is unlikely to have any impact on household mail in the city.

“Only 11 delivery offices in total in Scotland are taking part in the strike and as Dundee is not part of it, it should not affect deliveries in the city at all,” she said.

The Communication Workers Union said more than 12,000 of its members across the UK will take part in the strike, following the union’s claims that Royal Mail is reducing services and cutting the pay and jobs of workers without agreement.

In Scotland, delivery offices in Alloa, Anstruther, Bathgate, Bo’ness, Cowdenbeath, Dalkeith, Dunfermline, Edinburgh Central, Edinburgh South West, Edinburgh North West, Grangemouth and Kinross will take part in the strike.

The processing and distribution centre in Edinburgh will also bear the brunt of the postal worker’s walkout.

During the day of action, the CWU will also deliver protest letters to the Royal Mail’s chief executive, Adam Crozier, and business secretary Lord Mandelson, and will release balloons over Royal Mail workplaces across the UK.

Dave Ward, CWU deputy general secretary, said there are “serious and growing problems in the postal sector which urgently need resolving”.