Just as I hoped and thought, the TiddlyWiki upgraded as a merge. BUT THE SAVE CHANGES OPTION MUST BE DONE!
Managed to sort out the styles too.
Used StyleSheet to drop my styles in - good advice from the tutorials in "wiki for the rest of us" site.
Things are making sense. I just need to get used to using one or two things in the wiki language.
Links seem ok.
So far, so good.