It is true that interviews are not always required. However, sometimes a supervisor wants to get more information about you and your project before they commit 3-4 years of their life in supervising you. The mere fact that your application was sent to a supervisor already is proof that admissions feels that you pass all the requirements of admission and is now at the point of marketing you to supervisors to supervise you.
Hi! Are you going to UCL? I received an offer from UCL but was waitinglisted for the faculty funding.
Congrats on your acceptance to UCL, jjjxxx!
Thank you, joeyman365!!