HC Deb 29 January 1998 vol 305 c307W
Mr. Gordon Prentice

to ask the Prime Minister by what means an individual can establish whether he is the subject of an MI5 file in cases where the category of the file is no longer the subject of security service interest. [26228]

The Prime Minister

In order to safeguard the operational effectiveness of the Security Service it has been the policy of successive Governments not to disclose information about the operations of the Security Service including about whether the Service holds or has held files on any individual.