Legal deposit has existed in English law since 1662. Every new publication and every new edition of a publication, each of which may contain corrections, amendments or additional content, is liable for deposit.
An ISBN is a 13-digit code which identifies a specific edition of a book title from one specific publisher and is unique to that edition.
ISBNs for UK publishers are issued by:
UK International Standard Book Numbering Agency
62 Goldsworth Road
Tel: +44 (0)1483 712 215
Web: Nielsen ISBN Store
An ISSN is an 8-digit code which identifies a serial publication, i.e. a publication issued in successive parts, having a common title, and intended to be continued indefinitely. ISSNs are issued by:
ISSN UK Centre
The British Library
Tel: +44 (0)1937 546959