National Library of Scotland interview questions

I received an email saying I had been invited to do a verbal presentation on a certain scenario. Using my knowledge and experience I had to prepare a ten minute presentation. Nothing else was on the email and I practiced this presentation for a whole week. They told me at the start of the interview that the presentation was just an ice breaker and would be doing a hour long interview on competency which I wasn’t prepared for. To say I was disappointed is an understatement.