Here’s an update to the previous entry regarding losing my phone addressbook. In the Apple Address Book application (in OSX) if you select all the names in the Name column you can right click and export all the vCards in a single file. You can also use the bluetooth option “Send File” to send the .vcf file to the Nokia 6822 and the phone then sees it as a business card that has just arrived and offers to add it to the addressbook.
Unfortunately it only adds the first entry in the file to the addressbook and where the “is a company” option has been ticked in Apple Address Book, it imports the record with an empty name value.