Corporate and business immigration to the UK is largely (but not entirely) governed by the “points-based” immigration control system. The points-based system has been introduced by the UK Border Agency incrementally over the last few years and is a broad scheme that covers a range of working visas and study visas for overseas nationals. It is called the points-based system because visa applicants score points for satisfying the various requirements that each visa type has. Simply put, if an applicant scores sufficient points then they may qualify for the visa in question.
The points-based system consists of different sub-schemes or “Tiers”, which are: Tier 1, Tier 2, Tier 4 and Tier 5.