The TUC Congress opens in Bournemouth today with a warning that unemployment could be as high as 4.75 million.
A TUC report published ahead of the south coast meeting said wider measures of joblessness should be incorporated into the total, including the economically inactive.
As well as the 2.5 million official jobless figure, a further 2.26 million people want a job but are not classified as unemployed, the TUC said.
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Figures suggest that more than 11 million homes, or 42%, are in credit to their energy company.
Undivided, which represents more than 4 million young people, has set out its top issues in an open letter to political leaders.
John Wombell, 58, was jailed for eight weeks after admitting making the grossly offensive call to the Broxtowe MP's office last November.