So, I think it is important I post this.
If you wish to invalidate your UK warranty with Nokia over your N95/N95-8GB or any handset, go and change your product code with NSS then use Nokia Software Updater to update.
Nokia keep logs with NSU, they know you changed your product code, and as they are a scummy company, will then refuse to honour your warranty.
Solution:
Use NSS if you wish to change your product code, which can also be done with Phoenix, then use Phoenix to upgrade your firmware yourself.
It's important you familiarise yourself with the Phoenix interface, but it's basically very simple to use. You just need the software packages, and your normal USB able to your Nokia handset.
Why am I posting this? Well, Nokia wont know you've changed the firmware yourself, and the product code change will only be known by you. If something happens to your handset, Phoenix has a 'dead flash' feature, meaning that unless all hell breaks loose on your phone (very unlikely, most warranty problems are related to screen, software problems, or hardware problems with the keypad) then you will still be able to, at the very least, flash your original product code back to the handset.
If the service centre see you have the original product code on your handset when trying to claim for your warranty, they will be none the wiser.
In my opinion you would have to be crazy to use NSS+NSU as a software update combination right now. Go with phoenix. I'm not too technically minded, and I worked out how to use it in half a day.
Hope this helps someone.
Thanks.