Illustrative example
A parent named in a lives-with order books a six-week trip abroad to visit family and tells the other parent that consent is not needed because the children live with them.
Subsection (2) permits removal from the United Kingdom for a period of less than one month by a person named in the order as someone with whom the child is to live - and only by that person. The fact that decides this is the length of the trip: six weeks is outside the exception, so the written consent of everyone with parental responsibility, or the leave of the court, is required exactly as it would be for a shorter trip taken by the other parent.
They agree a four-week trip with dates, addresses and flight details shared in advance, video calls twice a week, and written consent given for that trip only.