A unique reference number given to a passport book issued by Security Printing and Systems (SPSL) or the United Kingdom Passport Agency.

The digit allows identification of the place of issue.

Note:
This was e-GIF approved for use in NHS England.
e-GIF and the Government Data Standards Catalogue have been archived and are available for reference only.

This attribute is also known by these names:

Context	Alias
plural	PASSPORT NUMBERS