There once were International Graduate Scheme (IGS) and Tier 1 (Post Study Work), but they were both abolished.

http://en.wikipedia.org/wiki/Points-based_immigration_system_%28United_Kingdom%29

Tier 1 (Post Study Work)

Tier 1 (Post-study work) is an obsolete immigration route. Under the scheme, students who have successfully completed a degree at a UK institution could apply for permission to work in the UK for two years without needing a work permit. Holders of postgraduate certificates and postgraduate diplomas were originally eligible to apply, but these qualifications were removed from the eligibility in April 2009.

The Post Study Work scheme combined the previous one-year International Graduates Scheme (IGS) and two-year Fresh Talent - Working in Scotland Scheme (FTWiSS) into a single UK-wide two-year work scheme. Those already working under the IGS could have switched into the new scheme for a maximum total leave of 24 months.[12]

The UK Border Agency described Tier 1 (Post Study Work) as "a bridge to highly skilled or skilled work. People with Post Study Work leave are expected to switch into another part of the points system as soon as they are able to do so".[13]

Tier 1 (Post Study Work) was not affected by the cap on number of skilled migrants coming to the UK which was introduced on 19 July 2010,[14] but on 26 November 2010, the Home Secretary announced that she was consulting on closing Tier 1 (Post Study Work).[8] The scheme closed on 5 April 2012.


Now, only PhD students are allowed to be in the UK for a further 12 months after the end of course.

http://www.ukba.homeoffice.gov.uk/sitecontent/newsfragments/81-tier4