In reply to Bruce Hooker:
> (In reply to RCJ)
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> [...]
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> That's piffle, no one ever said this till wikipedia came along - we all called the British flag the Union Jack, and most still will... except pedantical googlers, that is.
Sorry Bruce, not a googlers invention - I remember my dad having a good old debate about this with the barman aboard HMS Victory back in the late 1980s, and my granddad used to correct me on it too. However, if by "piffle" you mean "something that really has no official standpoint, and is so unimportant as to render debate laughable" - I'll give you that!
The facts of the case:
1) "Jack" to describe a small flag flown from the small mast mounted on the bowsprit, predates the James I's reign (and original union flag).
2) Jack refers to any flag flown in this position, but not generally to a flag flown out of this position. See usage of term "jacksprit" for ships without a bowsprit from Victorian times onward.
3) A royal proclamation by George III specifically distinguishes "Ensigns, Jacks, Flags, and Pendants" with reference to what can and cannot be flown by merchant ships, and refers specifically to the Union Jack in this context. However the flag in the corner of the red ensign is referred to as the "Union Jack", but it also refers to the red ensign as a "red jack" suggesting this flag was meant to be displayed as a jack... Or that they were as confused as everyone else.
4) The UK's national flag is based on common custom not statute, and what it should be called has no definitive reference.
5) "Union Jack" has been in common usage to refer to the flag in all situations, and such usage has not resulted in objection within parliament and the admiralty.
6) The Flag Institute don't mind which you call it, all though they do mind very much if you fail to observe correct etiquette when flying it.
In short, just about everyone calls it the Union Jack and this is fine... Union Flag, British Flag or Flag of the UK are all similarly acceptable. The fact that we (including flag geeks) have accepted an ambiguous use of the term Jack shows how much anyone should care about what you call it!
http://www.london-gazette.co.uk/issues/15329/pages/84 http://www.flaginstitute.org/index.php?location=7.2 http://hansard.millbanksystems.com/lords/1908/jul/14/the-flying-of-the-unio...