In October 1996, the British Library (BL) began to contribute NARs online.  These records can be identified by the prefix "nb" in the 010 of the record as well as the code "Uk" in both subfields of the 040.

The BL must be informed of any changes to the 1XX field on any record with the code "Uk" in $a of the 040.  Send an email message to BL Authority Control staff at or through the BL NACO liaison giving the LCCN of the record and a brief explanation for the proposed change.

See also:

Section II:  Additions and Changes to Authority Records