The Telecommunications (Data Protection and Privacy) Regulations 1999

1.  The data referred to in regulations 7(1) and 8(1) are data which constitute personal data whereof the data subject is a subscriber to, or user of, any publicly available telecommunications service or, in the case of a corporate subscriber, would constitute such data if that subscriber were an individual, and which comprise information in respect of all or any of the following matters, namely–

(a) the number or other identification of the subscriber’s station;

(b) the subscriber’s address and the type of the station;

(c) the total number of units of use by reference to which the sum payable in respect of an accounting period is calculated;

(d) the type, starting time and duration of calls and the volume of data transmissions in respect of which sums are payable by the subscriber and the numbers or other identification of the stations to which they were made;

(e) the date of the provision of any service not falling within sub-paragraph (d); and

(f) other matters concerning payments including, in particular, advance payments, payments by instalments, reminders and disconnections.