apparently this version is extremley rare in the uk (i have seen one go for almost £70 on ebay)
and its actually named : Naruto Clash of ninja - European version.
and the funny thing is, its the second one in the series. so that means clash of ninja one was never ever released in the uk....a bit weird...anywho,
i think they diceded to release the second one in the UK because the story arc in the game is probably the same as the uk tv show episodes.
the reason why its so rare is probably due to the GC being dead for the past year and a half.
i'm just glad i got all the Ninja Taisen games for my GC, and i own Narutimet Hero 2 & 3 for the ps2.