Hi there 😊,
Although I have not done a Uni of Liverpool interview, I have some other pharmacy interviews so I can advise.
So on the University of Liverpool website, it lists the Standards of Pharmacy Professional so have a look at that on the GPhC website. Make sure you're able to give some real life examples of how you have demonstrated these examples.
With majority of pharmacy interview, be sure to have some sort of answer for "why pharmacy", "why at Liverpool", "why not x instead" etc. Have a look on The Student Room chats which have an interview prep which is a great summary of things to have a look at.
I would also say have fun and be yourself at the interview. The interviewers aren't there to trick you but to assess you as an individual and looking at your values and qualities.
Best of luck for your interview!
University of Bath