After experimenting a bit with Tortoise running on Windows 7 (the terms import and export seem to work in the least intuitive way and the help file lacks a really basic How to Get Started tutorial), I managed to get the latest SVN version on my laptop and created a current version which I ftp'd onto a fresh wordpress site.
Realised quickly that I had to name the new plugin Simple-press and the install after that went well until the Integration stage which identified that the storage location for the Custom Icons folder needed to be created. I created that manually and so far everything looks good and I couldn't find any other issues.
Next step is to try plugins and templates/themes.
I am running WP 3.2 with Atahualpa 3.67 Theme.