You will need an ATAS certificate to do certain types of study and research in the UK. If you need an ATAS certificate, you will usually get a statement with your offer letter confirming that you need ATAS and telling you what to do next. Without this certificate, your visa application will be refused.
To apply for ATAS you need a statement from the University confirming the subject of your research or study. This is usually sent with your offer letter. If you don't have this statement, but need an ATAS certificate, please contact your Admissions Officer, whose details are on your offer letter.
Once you have your statement you can make your ATAS certificate application online to the Foreign Commonwealth Office (FCO). This should take no longer than 30 minutes to complete.
Find out more about the ATAS certificate