The UK version is still available from amazon.co.uk and is region free. I purchased it there since it is released by Warners and was available on Blu-ray in the UK during the period that Paramount had sold out to Microsoft/Toshiba.
BTW Paramount's reluctance to reissue/update their releases is not limited to Blu-ray, this has been going on for 30 years. By contrast, Warners has always done a better job. Since Warners distributes Paramount in the UK and believes in region-free releases, this gives the consumer another option.