I wrote an e-mail to Anchor Bay about this subject and they answered this:
"It is true that the aspect ratio for the DVD and the Blu Ray release are different, this is due to the source materials we were able to purchase from the Production Company who own the film, Handmade Films.
The DVD release in standard definition was 1.77 however when it came to gaining a High Definition version of the film the only masters available to us were in 1.66
We did consider arc'ing the feature into 1.77 but this would have removed even more of the picture so we left it in 1.66 to give the viewer the maximum amount of picture as possible.
I understand this is disappointing but a High Definition version of this feature in 1.77 simply does not exist. The only way to create one would be to go back to an original film print and telecine a new master which is extremely costly and would be down to Handmade Films who own the picture to decide to do.
As this is the only High Definition master, the only way to release this title on Blu Ray was to release as 1.66 or to not release it at all. The packaging was clearly marked to show that the aspect ratio was indeed different so as consumers can make the choice whether they want to purchase the disc or not."
It's a very kind message and I'm grateful for that, but it only confirms that the aspect ratio is wrong and that the claim of it being the original one is a false one. My recommendation is to consider very carefully this matter before buying the Blu-Ray.
Great film, BTW, but that's not the reason of me reviewing this product.