No they don't do background checks for sales assistant roles but they do for duty management and store management positions.
Need to take passport for eligibility to work checks
Yes all checks are appropriate for all positions.
Depends what position you apply for
I am hard working, I am single with no family comittments
Yes i believe they do 2 ref checks and takes a week or 2 at most.
Same as any other company
Honestly, they don't care if you're a serial killer. If you're willing to put up with 15 hour mostly unpaid workdays at a moment's notice, congratulations, that's all they want from you.