The flag of the United Kingdom (since 1801) displayed vertically. When hung vertically, the white saltire must be above the red saltire on the flag's proper right (the viewer's left). This is intended to show the heraldic seniority of Scotland (the white Saint Andrew's cross) over Ireland (the red Saint Patrick's cross).
This file was derived from: Flag of the United Kingdom (3-5).svg:
Own work based on: Flag of the United Kingdom (3-5).svg