The order of an individual surgeon’s list depends on what is on the list. Those who would be unable to fast for long periods will generally go first (eg children, people with learning disabilities, people with diabetes etc). Often major cases will go first, and more minor procedures at the end of the list. Or they may group similar procedures together, or prioritise the more complex cases, or patients with particular anaesthetic concerns. So basically it really depends on the specialty, the surgeon, the anaesthetist, and the other patients on the list that day.
Are you waiting for an operation? Hope it all goes well!