Flag UK

Flag of the United Kingdom Mounted 4x6".
The UK flag consists of three elements: the cross of St George (red on white) for England, the cross of St Andrew (white diagonal on blue) for Scotland, and the so-called cross of St Patrick (red diagonal on white) for Ireland. The original Union Jack/Union Flag adopted in 1606 was symmetrical: the red cross of St George outlined in white overlaid on top of a St Andrew's flag, which was blue with a white X.
In 1801, an Act of Union which made Ireland a co-equal member of the United Kingdom made it necessary to add a symbol for Ireland to the flag, but without obliterating any of the existing symbols. If the St Patrick's cross had been centered on the diagonal stripes, then St Andrew's cross would have been relegated to an inferior position, basically serving only as a border for St Patrick's. But Scotland was the senior of the two kingdoms, so this was unsatisfactory. The solution was to divide the diagonal stripes diagonally, so that the red St Patrick's cross would take up only half of each stripe, and so that half devoted to St Andrew would take the place of honor. Thus, in the two hoist quarters, the white St Andrew's cross occupies the upper position, and in the two fly quarters, the red St Patrick's cross occupies the upper position.
There is a right way up for the Union Jack, but it is not flown upside down as a signal of a ship in distress. That is only done with ensigns, in which the Union emblem occupies only the upper hoist quarter of the flag. When a British (or American) ensign is flown "union down," it is obviously distinguishable from one flown in the normal fashion. An upside-down Union Jack is not sufficiently different from a right side-up Union Jack to be useful as a signal of anything except that the person hoisting it wasn't paying attention.

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