I was under the impression the UK was not going to get the upgrade version due to some legal mistake MS made but they were going to give out only the full version. So i think you will end up with a full version. Either way you can do a clean install with the vista install. All you have to do is access the upgrade disc in vista and it puts a tag on the hd that is seen by 7 that will allow a clean install ontop of an existing vista install. So you are good to go either way.