The UK blu-ray is the standard theatrical version. I've never seen that version but I do own the director's cut on a region friendly US release.
btw I really like it, I think that the director's cut of Halloween II and Devil's Rejects are Rob Zombie's two best films.
Halloween II was lambasted so heavily that I truly expected the worst when I saw it. Was a pleasant surprise.
I don't like the first Halloween remake very much at all but I totally dig the second one. Perhaps it helps that I've only ever seen the longer version?
Here is a breakdown of the differences between the theatrical cut and the director's cut:
Halloween II (Comparison: Theatrical Version - Unrated Director's Cut) - Movie-Censorship.com