http://www.ukba.homeoffice.gov.uk/workingintheuk/tier1/general/applying/initialapplications/
How to apply if you are
outside the United Kingdom
The process for applying if you are outside the United Kingdom is:
Step 1: complete a self-assessment online using our points-based calculator to find out if you are likely to score enough points.
Step 2: go to the Visa services website, which you can find on the right of this page, to find out if you must submit any personal details in the country you are applying from to find the application form.
Step 3: take or send your form(s), fee and supporting evidence to the visa application centre. You must also arrange to give your biometrics, which are usually taken at the visa application centre.
We strongly advise you to bring all supporting documents with your application. We will not consider any evidence provided after we have made a decision.
If you are given entry clearance as a highly skilled worker from outside of the United Kingdom, you will be able to live and work in the United Kingdom for a maximum period of three years. When the end of this period approaches you will need to apply to extend your stay as a highly skilled worker.