Смотреть текст статьи: http://agentura.ru/dossier/uk/mi5/According to David Shayler, until 1994, new MI5 officers were required to have grandparents born in the UK. This ruled out a range of ethnic minorities who could have proved invaluable in penetrating extremist Islamic cells. The first black officer did not join MI5 until the mid-1990s... Here is MI5 dossier and its structure in 2003.