Union leaders are poised to support the commissioning of new research on pensions as part of a campaign against longer working and cuts in payments.
The TUC Congress will debate "attacks" by the Government and private firms on pensions, which has sparked a long-running dispute in the public sector.
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Another cold, frosty and foggy night for many. Northern and western areas will see thickening cloud, patchy rain and milder temperatures.
Temperatures have already plunged to -12C in some parts of the UK this winter - but Thursday could be the coldest day yet.