Just got this back from the Garmin UK guys reference upgrading:
"If you registered your unit after the 5th of January 2005, you will be entitled to the upgrade free of charge. If you registered your unit before the 5th of January 2005 you will be charged $150 (approximately £98).
To unlock the upgrade CD's you need to go onto our website and obtain a version 7 unlock code. Please click this link: