Submission of a brief CV and portfolio (6-8 sheets) at application stage. Then at interview stage it’s usually a single interview taking one of these formats:
Private sector:
45 minute talk through CV/Portfolio; discussion of experience, aims, ambitions; introduction to the company. Suit and tie pretty standard, even if that’s not what people wear day to day. Usually with a couple of the company directors.
Public Sector:
STAR type interview. Suit and tie, as above, usually in front of a panel of team leader, sector head and HR bod.