Thanks to TimeRider27 for the heads up...
If you register your Oris at the Oris Website www.oris.ch they will extend the warranty by another 12 months . The only condition seems to be that the watch must still be under warranty, ie has not passed outside of the original warranty period.
Sounds pretty good to get another year's cover just for the effort of filling in an online form. You can also elect to receive their newsletter or opt out if you wish.