Heavens, where is Jo? The X form of the cross is called the St. Andrews Cross from the fact that he was said to have been crucified on a cross of that form. Hence, you can always identify St. Andrew in a stained glass window by the X-shaped cross which he is usually depicted with or leaning against.

St. Andrew is, of course, the patron saint of Scotland. Oh, sorry, I forgot -- jmh is English, although resident in Scotland.