What data can be used without informing the data subject?
None. If a data subject has given informed consent to use of their data then this can be used without further consent. If additional information is to be collected or used and the data subject has not consented to collection then further consent must be sought prior to its use wherever practically possible. If the data to be used is anonymised and not linked to the data subject, this can be used without the data subjects additional consent.
