893766f8____The_University_of_Sheffield__What_will_happen
[Stage] 8 [What will happen] 
After you have received your CAS number, you can find details of how to make your visa application on the Home Office website. Please note that you will only be able to apply for your visa a maximum of three months before the date your course is due to start.
CAS number applications - Welcome - Prospective International students - The University of Sheffield
What will happen