Yes mate, you can use the United Kingdom and Republic of Ireland v930.5601 map with your v7.903 navcore.
If you use the v5 activation tool you will have to manually edit the meta file & add correct info from the map thread. You can use notepad to open & edit it.
The version 6 is probably better & easier - just copy it onto your tomtom & then run it using windows explorer, you will have to update the meta file first, but this option is still working on the v6 activator.
Social Networking Bookmarks