Ensign Etiquette – extract from RYA website
When at anchor or in a harbour in British waters the proper time for hoisting (raising) the Ensign is 0800 (0900 in the winter months from 1st November to 14th February inclusive). Ensigns are always lowered (struck) at sunset or 2100 local time if earlier.
The most senior position is reserved for the Ensign. In practice this will be the pushpit.
The vertical measurement of a flag is called the “hoist” and its length “the Fly”. If only one measurement is given it will be “the fly” (See Part II).
Fly dimension measured in yards and measurement is 1” per foot of vessel therefore 1.5 yd ensign.
Experience Sailing 