I applied online. The process took 3 days. I interviewed at NEXT (London, England) in Jul 2017
Interview
Very easy, just basically asked about school / uni, just wanted to make sure I was literate and polite enough to face the public and could deal with customers appropriately
They will show you the store and give you tasks on how to help customers, displaying competencies in customer service, this depends on deparments because if you work in another department, they will make you tag or fold clothes.
Applied online, did an online assessment, then a video interview. After that they made me come into the store and put an outfit together (for a wedding guest I believe) in 30 minutes. You pick out the outfit, jewellery, makeup, shoes, other accessories etc.
Easy interview on the phone then in store trial where i had to help customers and tidy the shop floor. The process was quick and easy and I was offered the job on the spot