In reply to apache:
Well...
It was required in the old version of the PPE Directive to have the date the CE Marking was applied to the product, which is indeed 2005 in this case.
It is legally required for the PPE to comply with the legislation applicable at the time the product was 'Placed on the market', that is, the moment at which Petzl advertised it for sale. It is, however, not required for distributors (the shop you bought it from) to be ensuring their stock is in compliance with the most recent legislation.
Petzl's website seems to suggest that anything which is not declared to the most recent legislation or standards should be retired, which is in direct contrast to the European Commission guidance...
I would say if you're looking for some advice, trading standards may be able to help, as I doubt Lyon or Petzl will be particularly interested.