I filled in the online interview and quickly received an invite to a 'magic interview'-a group interview for 9 of us, led by a manager and observed by about 3 supervisors. It was much as described elsewhere, introduce your neighbour and then after a video presentation, do a group activity (spaghetti and marshmallow tower). We then had a tour and had to fill in an availability sheet.
I got a call the next day inviting me to an individual interview the next week. This consisted of two managers who asked a lot of questions about my experience of customer service and Asda in general and then a short time in the store, being asked to find items etc.