Mar/Jun 2017 Q4(c) Materiality

Only a small amount of the provision has been used and more than 25% has been reversed as no longer required - so we are looking at the maximum potential impact the balance has on the financial statements - if it was not required (at all) it would be written back in full.

I don't understand your answer.

You need to read it not only in conjunction with Marthew's post but the information that was given in the question.