K800i - Vodafone - UK NCK Code?

Hi guys,
I am without a phone due partly to my own stupidity and partly an artic wagon causing a bit of damage when running over a handset...

I have dug out my old K800i (one of my favourite ever phones), but it is locked to O2 in the UK. I am with Vodafone. Have got to the screen where you enter NCK code (1 of 3 options) - but I can't fnd any codes online. As it's such an old model is a code readily available these days to get me up and running?

Any help appreciated.
Cheers

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