Hopefully someone can tell me what has been going on.
I restarted with my 9900 over the weekend when I found a Canadian carrier that would work on my UK issued phone.
I have notices today that all my contacts that were in my iPod are now in the 9900 and anything I add to the 9900 is tranferred near instantly to the iPod.
I can't understand why this is happening, I can only assume there is a link with the email address as the same one is used for both.