Mr. Brian Purcell:

There is a mixture of seven day and five day liability arrangements, with some shifts running from 8 a.m. to 8 p.m., some from 8 a.m. to 5 p.m. and others designed to cover peak demands at relevant times of the day. Night duties are separate to that. Fewer duty staff are required at night and fewer staff are required at certain times of the day relative to other times of the day.