Unfortunatley as Mandy says even the article gives a misleading picture, as there are no legal standards for the words "free range", "outdoor bred", "outdoor reared" etc. The NPA did try and get some interst in the EU setting standards, but nothing has come of this.
In the meantime whilst some supermarkets and suppliers have signed up (only 50 to date) to a common usage of these terms by no means all have eg Aldi hasn't.
And whilst Sainsbury's claim that removing the red tractor symbol will actually remove confusion, it was one of the few that most consumers had some confidence in.