“Traffic” data, for the purposes of data interception and retention is defined in RIPA:
(i) any data identifying, or purporting to identify, any person, apparatus or location to or from which the communication is or may be transmitted.
(ii) any data identifying or selecting, or purporting to identify or select, apparatus through which, or by means of which, the communication is or may be transmitted.
(iii) any data comprising signals for the actuation of apparatus used for the purposes of a telecommunication system for effecting (in whole or in part) the transmission of any communication.
(iv) any data identifying the data or other data as data comprised in or attached to a particular communication, but that expression includes data identifying a computer file or computer program access to which is obtained, or which is run, by means of the communication to the extent only that the file or program is identified by reference to the apparatus in which it is stored.