Please quit adding new threads with the same material. If you're going to keep posting the same question, add it to the end of the thread you already started.
Here is the a link to the application form that you will need to fill in, namely Form SET(O)
http://www.ind.homeoffice.gov.uk/6353/11406/set(o)may.pdf
Section 8 (on page 10 of 13) lists every document that you will need to send.
As far as your work permit goes: my understanding is that work permits entitle you to work in a particular job. If you changed jobs, you should have had approval from the home office. If you are not working in a job that you were not given a work permit for, then you should consult with an immigration consultant immediately. You will need professional advice, not just advice from a website.
Good luck.