Politically, Great Britain refers to England, Scotland and Wales in combination. So let's say you have a sixpence from... Well England made coins, Scotland quit making coins around the early 1700s, after the union. I don't think Wales made any coins at all, but correct me if I'm wrong. So what's the proper form? Do you have a sixpence from Great Britain, or do you have one from England?
I always refer to them as British. There are some shillings from the 1940s to 1960s that have both an English and Scottish version, so when I write on those 2x2s, I write "Britain 1 shilling (Scottish)".
If the sixpence is from before 1707 it's English. Afterward it is legal tender in all of the United Kingdom so I would say Great Britian would be correct.
You can always select all, or a portion, of your reply, and click on that eraser icon in the upper left corner of a message box. That removes the extra formatting. As for the "correct" term, well, the name of the country is "United Kingdom of Great Britain and Northern Ireland". So United Kingdom, or UK, sounds good to me, but Britain should also work. And no, there is no "Wales" coinage - although one could argue that all modern British coins are Welsh, as the Royal Mint is in Wales, hehe. Also, the £1 coins are often made in four different versions: one with an England specific design, one for Scotland, one for Wales, and one for Northern Ireland. But neither of these is specifically Scottish or English money ... Christian