The interview starts in the usual way talking about your CV, your previous work experience and then why you want to work for Screwfix. Then it becomes very much a general retail interview - "Tell me about a time when you had to work with someone else to achieve a goal" etc
Usual retail based questions;
What can you bring to the company? what can you work? what previous experience?
Answered - Store Assistant (Current Employee) - Loughborough
Competency based questions. Experiences in retail and customer service based questions. If you are applying for a sales assistant you don't need to research the company. Only applies to management.
Typical retail based question
Answered - Assistant Manager (Former Employee) - St. Neots, UK
They will ask what you know about the company. So research
Answered - Supervisor (Current Employee) - Buckinghamshire