Began by applying online and answering some questions along with submitting my CV/Cover letter.
Heard back within a week asking me to complete a video interview. Once this was completed, I was invited to an assessment centre. The day after the AC, I heard back from them asking me to attend a final interview the week after.
I then heard back from them again within a day or two with a job offer.
Overall pleasant experience, friendly interviewers, just be yourself and you should be fine. Noone is trying to 'catch you out' or anything like that.
I prepared more than I've ever prepared before, I had an A4 pad of paper almost half full of research and practice questions, so I found the whole process slightly above average in difficulty. Without preparation I would have definitely failed.