From what I'm reading, One Piece Film: Z was released in France on May 15, 2013, Germany on Nov. 29, 2013, Italy on Jan. 5, 2015 and in the UK on May 25, 2015.
Sources: http://onepiece.wikia.com/wiki/One_Piece_Film:_Z
Edit: Here it is on Amazon UK.... http://www.amazon.co.uk/One-Piece-Film-Z-Blu-ray/dp/B00TH9YQH8/ref=sr_1_1?ie=UTF8&qid=1445040816&sr=8-1&keywords=one+piece+film+z
I got it from HMV,
but this is the version you're looking for. It was released last Monay: