Tier 2 General - Change of Employer

[aja]

Hello,

I am looking for some guidance in the process for changing Jobs (employer), while being in Tier 2 General Visa.

> Currently working in company A, which has sponsored my tier 2 General visa.

> Have attended interview in company B, they do have tier 2 sponsorship license.

> The Job level i will perform is the same in company B as i used to perform in company A.

> If company makes an successful offer for me join; i would like to know the sequence of processing the new Visa with the new company and when to resign from the existing company.

Many Thanks in Advance