To ask Her Majesty’s Government, in the light of a letter from the Home Secretary, Theresa May, to Lord Marlesford, how a series of sophisticated search algorithms and the search systems incorporating them would be able to make the link between a UK passport holder's passport and a second passport of another nationality held by the same person if there is not a record of such second passports held by British passport holders held on a central UK government database available online to immigration officers.
Answered on
27 May 2016
It is longstanding policy not to disclose details of how search systems work, as to do so would not be in the interest of border and national security.
Answered by
Home Office