Mr. Ed Sibley:

Mortgage restructuring has been done or should have been done in line with our guidelines about what makes a sustainable restructured arrangement. This is an individually tailored restructured arrangement. In many circumstances – approximately 40% across the system – those borrowers are on lower repayments.

It could be because they have a split mortgage where a large part or part of the loan has been warehoused and no interest is being charged on it.