Thanks everyone, sorry been offline for the weekend. No, it's not white, and now that I've finally got it setup, when I log in it shows as a Superhub2 on the login screen. So I suspect it's an upgraded version to the one I had previously then? (or maybe I had the original superhub and thought it was a 2 - I know it wasn't the very first one, maybe that was an upgraded first version?)
When I applied for the free speed upgrade they said I needed to upgrade my equipment and sent this out. I'm glad they did, as the old one was getting a bit touchy anyway. The option to choose from the two bands (rather than have it set to one or the other) is handy, and I've reset my SSID's and passwords to personal ones (first thing I did).
Thanks for the responses, and sorry I seemed to have disappeared. I appreciate all the help the members here give