WISEAS is my personal expansion on the oft-used W.I.S.E. which stands for Welsh, Irish, Scottish, English. I simply added Australian, Swedish, because my Imp told me to.
Yes. They are STILL used simultaneously. At the Commonwealth Games, for example, the constituent Nations of the United Kingdom use their own flags (England, Scotland, Wales, Northern Ireland), and compete as their own national representatives - unlike the Olympic Games where they compete as the UK/GB.
There is no reason the use of the flag of St George would be creating any errors requiring the intervention of a Data Doctor.