British Prime Minister David Cameron and Home Secretary Theresa May, unseen, visit the UK Border Agency staff at Terminal 5 of Heathrow Airport, London where they were shown differences between fake and real passports Tuesday Nov. 23, 2010. Britain's Home Office says it will be announcing the country's permanent immigration quota _ a new limit intended to dramatically reduce the number of non-EU nationals permitted to work in the U.K. (AP Photo/ Steve Parsons, Pool)