The marketing campaign will see full page ads running in The Guardian, The Times, The Daily Mail, The Independent, The Daily Record, The Daily Mirror and The Scotsman newspapers.

Adrian Jeffery, director of mightysmall, said: “Our client has asked us to help them spread the message to the country that selling off the profitable parts of the Royal Mail is not the way to modernise the postal service. In fact it will have the opposite effect.

"The Union’s  “Keeping the public posted” tour will travel the country from John o’ Groats to Lands End to highlight the facts that prove we should be keeping the service in public hands. And mightysmall will be producing a nationwide press and poster campaign to help get those key messages out there.”

The Communication Workers Union and the Royal Mail Pensions Trust appointment MediaHouse both appointed MediaHouse Internation last month to handle its PR for the campaign.