For the role of student ambassador there is no informal interview process. To apply you just need to register your interest in the role and fill in a quick form
I interviewed at Bath Spa University (Bath, England)
Interview
Straightforward, friendly, they sent me the questions to prepare in advance. It was an online interview. Only negative is that I'm still waiting for feedback on why I wasn't offered the job.
Interview questions [1]
Question 1
Why do you think you are a good candidate for the job?
Only one round and it was done by panel asking set questions you would expect for the role. Not hard questions, but take some time to think about them.
Panelists were good.