I just checked and my discs appear to be region-free. The product SKU is 5051561000553.
By the way, don't believe what you may read online about the discs being 1080i. Mostly the video format is 1080p. Some parts of the title sequence (credits) are 1080i, and one or two sequences filmed in difficult locations are 576i (PAL) and not 480i (NTSC).
Comments from buyers in the US on amazon.co.uk indicate that they were able to play the discs successfully. Your mileage may vary, of course.
By the way, don't believe what you may read online about the discs being 1080i. Mostly the video format is 1080p. Some parts of the title sequence (credits) are 1080i, and one or two sequences filmed in difficult locations are 576i (PAL) and not 480i (NTSC).
Comments from buyers in the US on amazon.co.uk indicate that they were able to play the discs successfully. Your mileage may vary, of course.