The UK government is in the process of replacing its current system of immigration with a 5 tier system which has mandatory points criteria for each of its 5 tiers.
The information which follows is based on details of the points based system published by UKBA (United Kingdom Border Agency). It is almost certain that this information will be updated as the points based system rolls out over the next year or so, so you should visit this page at regular intervals to check for amendments or changes.
You can use the Points Based Calculator to check which schemes you are eligible to apply for on: http://www.ukba.homeoffice.gov.uk
or by clicking on the link to the PBS calculator
If you have any questions, please contact: international.adviser@strath.ac.uk
The 5 tiers are as follows:
Tier 1: Highly Skilled Workers
With 4 sub categories
General
Post-study work
Investors
Innovators
Tier 2: Skilled Workers with a Job Offer
Tier 3: Low Skilled Workers
Tier 4: Students