The Home Office is the lead government department for immigration and passports, drugs policy, counter-terrorism, police, and science and research.
http://www.homeoffice.gov.uk/

The UK Border Agency is responsible for securing the United Kingdom borders and controlling migration in the United Kingdom. We manage border control for the United Kingdom ...
http://www.ind.homeoffice.gov.uk/

Information on how to obtain passports and visas, links to information sources about migrating to the UK, and the latest on ID cards.
http://www.homeoffice.gov.uk/passports-and-immigration/

Offers how-to articles, downloads, templates, clip art, and training.
http://office.microsoft.com/

The Home Office is the United Kingdom government department responsible for security and order. As such it is responsible for the police, fire services and MI5.
http://en.wikipedia.org/wiki/Home_Office