What wiring harness do i need for a peugeot 207 2008?

fitting a Pioneer cd player in a Peugeot 207 2008 plate. Bought PC2-84-4 from halfords as they said it would work, but it does not work. Any idea's?|||YES . go back to halfords and give the retardsa right bolloking , and dont ever go again . DEMAND your money back .