Thanks for all your help, but I've decided I don't need it.

I can still get to XP by changing the boot device in BIOS, and have decided I don't need to access Kubuntu as I never used it anyway and only installed it to see what all the fuss was about.
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Mk2a RioCar 120Gb - now sold to the owner of my old car
Rio Karma - now on ebay...