Visteon workers, including hundreds from Swansea, have been fighting for better pensions since the car parts manufacturer went into administration in 2009.
Today's petition presentation is the latest in a long line of attempts to fight for some of the money workers say they are owed.
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Kirsty Williams successfully defended her Brecon seat, but her party lost four others in a disastrous night.
The body of 75-year-old Iris Owens from Ystrad Mynach was found on Tuesday.