I went through an agency to M&S to a job which i thought to be a reporting job but it turned out to be it is accounts receivable position.
It was the agency mess things up so can't say much about M&S on this.
There were 2 people in the interview. Manager was asking questions mostly and supervisor was taking notes and also asking 1-2 questions if more clarification is needed.
There are some capability base questions (5-6). You do not receive capability pack to get ready for them but expect questions like ' Describe a time when a customer was dissatisfied with your or your team's performance and you had to solve it'
Office location is in a good place - Spinningfields . Easy to commute.
The job I went for was paying between 19k to 21k. Also they offer you study support if you are doing CIMA, AAT or ACCA.
I know people working there - there is some overtime involved. Good name as a company but looks like a bit disorganized.