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.
About 200 former workers from Visteon in Swansea, who claim they lost out on their pensions, are handing in a petition to Downing Street today. A High Court hearing is due to take place in May involving all former Visteon car parts workers.
Visteon took over Ford's operations in 2000, and workers were transferred into the new organisation. The firm then went into administration in 2009 and employees claim they lost significant amounts of money. Some say as much as 40% of the expected value of their retirement pensions was lost.
Workers say Ford should have given their pensions greater protections, but the company says is was not their responsibility once Visteon was created. Ford has previously said that it views the claim as being without merit, and will defend its position vigorously.
President of the Wales Trade Union Congress (TUC) has heavily criticised the UK Government over cuts to public sector workers pensions.
Stephanie Wilkins has worked as a bio medical scientist for the NHS for over twenty years.
She claims she has been forced to join fellow NHS workers, and others from across the public sector, on the picket line in sending a message to the UK Government.
Like all those taking part in this 24 hour strike Stephanie says she doesn't want to pay more to work longer and get less.
The changes will mean that she will be £30 a month or £1,400 a year worse off.
NHS staff from across Wales have formed picket lines outside hospitals today as part of a 24 hour strike over UK Government planned changes to their pensions.
Amongst those striking are health visitors, pharmacists and paramedics.