If you applied for your Tier 4 student visa before 5 October 2009
If you want to leave your current course in order to study a course with a different education provider under your current permission to stay in the UK, you must get our written permission. To request this permission, you must send an email message to [email protected]. The message must include:
the new course and its start and finish dates; and
your new education provider’s name, address and contact details.
We will write to tell you that you are allowed to study with your new eduction provider under your existing permission to stay, if:
the new education provider is on the register of Tier 4 sponsors, which you can download from the right side of this page; and
we can confirm that the education provider wants to be your new education provider; and
the course meets the requirements for your Tier 4 category. However, Tier 4 (General) students may continue to study a course at or above level A2 of the Common European Framework of Reference for Languages.
After you have sent us your request, we will write to you saying that we have received it. You can start your new course before we have decided whether to approve your request - but you do so at your own risk, as we may refuse the request.
Under the Immigration Rules, we may shorten your permission to stay as a student if you change your education provider without getting our permission.
If your new course will finish after your current permission to stay expires, you will need to make a new Tier 4 application to us. You will therefore need a confirmation of acceptance for studies from your new education provider.
http://bia.homeoffice.gov.uk/studyingintheuk/adult-students/changes/#