Cilea - Adriana Lecouvreur [Blu-ray] 
It looks like a Blu-Ray disc.
Then the Amazon.co.uk product page has wrong product details!
"Format: Classical, DVD-Video
Aspect Ratio: 4:3 - 1.33:1
Number of discs: 2 "
It says 'DVD-video' (Not a Blu-Ray)! Next, 'Aspect Ration 4:3' (this is wrong too, for blu-ray must be 16:9).
Next, 'number discs 2' (totally wrong, should be 1 disc!).