It really depends upon what the entry was in the Contract Data Part Two: if the Contractor referenced the 2011 list and said something like "or as replaced by any updated list", then the Employer/Client has accepted that as part of their offer is held to it.
If there is no reference to any potential update, then the 2011 Published List ould be the one to reference.
Do note that the previously accepted CE quotations could not be revisited in the light of any update
If there is no reference to any potential update, then the 2011 Published List ould be the one to reference.
Do note that the previously accepted CE quotations could not be revisited in the light of any update