if you can get this drive in the uk it looks pretty nice and plays blue ray nicely. I have it and it plays everything great.
http://www.amazon.com/Samsung-SE-506BB-TSBD-External-Blu-ray/dp/B00AO1XFM0/ref=dp_ob_title_ce
I use macgo blue ray software with it. its about 45 dollars but plays ALL blue rays. I have had no issues with it and it even plays many types of blue ray that most wont.
Most free blue ray software wont play all blue rays. If a blue ray wont play its 99% chance the software not the blue ray player. For instance I know there is a extension for vlc that is free that can play blue rays but it doesnt play certain types of blue rays so there is always a chance your disc wont work. Its this reason alone its better to invest in good blue ray software. I dont work for macgo blueray software but it has worked great for me with all discs that ive tried.