OK, I have managed to sort this out by manually deleting entries in the sp_folders and static_pages tables where a static page was entered when I first mounted Static Pages. This initial attempt was made without having mounted General Comments onto a url and seems to have caused problems that the Package Manager cannot fix. Specifically the integrity constraints between the content repository and the static pages tables end up blocking the removal of the static pages instances even when an instance shows that there are no static pages found.
I must say that a 'remove all references to this particular package because I have screwed up the installation and want to start again' button would be extremely good news!
R.
