First question: "Could anyone have or had access to either your debit card details or your debit card?"
What a dumb question - the answer is, of course, yes, as every time I buy anything on-line or in person, someone gets access to my debit card details. Of course, the bank also have my card details. Why even ask?
Do they do this as a trick question? After all, they then say: FALSE STATEMENTS CAN RESULT IN PROSECUTION