Yes, I think every level has a responsibility to determine whether relevant risks are addressed and control objectives met. It may not be in the form similar to each level but there should be accountability.
Dunelm rate their stores daily on their commercial awareness and availability but not working there you don't know what they focus on, this is a loaded question and is evaluating your retailing standards, my advise is pitch lower than you would have.
Answer questions from experience, however do lots of pre-thinking about the type of questions they may ask so you're ready/can adapt your answers to suit. There are lots of situational question job websites, just make your own list before the interview
There is no single model that delivers to all expectations and intelligent clients appreciate that in general terms squeezing the price to much effects the ability to perform to the required standards. The most important factor in this industry is the people and in order to attract and retain the right staff you need to continually invest in them whilst appreciating that we are all individuals.