Illegal immigrants have been working at some of the most sensitive Government offices in the country - including the headquarters of the UK Border Agency - a Mail on Sunday investigation has discovered.
Following our enquiries, the Home Office admitted employing a dozen illegal foreign staff over the past four years - 11 Nigerians and a Ghanaian.
Ten of them secured cleaning jobs at Becket House, the headquarters of the UK Border Agency, which vets immigrants. The building in Croydon, South London, also serves as an immigration detention centre, holding up to 270 people awaiting deportation.
Two other illegal immigrants worked at the Whitehall headquarters of the Home Office, which houses the office of Home Secretary Alan Johnson. One was a chef in the canteen, while the other worked as a security guard on the front door for 19 months.
The Home O
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