Hi Andy,
I think ( and emphasize the word think) that if it is from another EU country then it would be duty paid in country of origin therefore nothing "extra" extra should be due. I don't think this is not the case for goods for resale though. Hence the popularity of the "booze cruise" of those down south when exchange rates where in our favour, all for personal use officer hic.
I'm ready to be shown to be spectacularly wrong on this one though, so don't take just my word on it.
cheers
Mark