Consultation is required to vary an extended hour shift over the normal 8hrs, however where an extended hour shift is already being worked (9hr 10hr 11hr etc) it is considered to be already agreed, for instance the one individual moving into a section is not consulted/votes because the 80 who work that roster have already voted on and accepted it. They can collectively however decide to revert to an 8hr shift for any or no reason at any time.