I interviewed for 2 different courses, accepted the offer on one of them. The experience really depends on which course you interview for, and also who interviews you. One was a standard motivation and getting to know you as a candidate type of interview, while the other one was a grilling session on how much you know about the programme/chair partners of the course.

Good friendly interview process where they made me feel at ease asked relevant questions the course and basic aspirations some questions on maths and all but overall okay and yes dont worry it is gonna be fine no stress