As you say it's an either or situation, not a big problem as I can just boot it up without the SD card to get back to the 9.430 version. It was only after I did the update a few weeks ago that I noticed that things had changed, the map looked different, you can display more in the info bar & it is split into 3 sections. A nice bit was the middle section which shows the icon for the next turning also allowed you to switch between 2D/3D (I used to have the icon on the screen for that) I tried to search on the Tomtom site to try to find what all the little tweaks were but couldn't find anything. I believe that some of it was to do with removing the French speed cameras (must remember to check I can still switch them off on the truck map).

Thanks again for the help, I think I've got the hang of changing the maps now.