According to the cinematographer the series was shot in 24fps and according to AcornDVD, "Hi there, the frame rate for both DVD and blu-ray will be 25fps. Many thanks, Acorn DVD" (2:04 PM · Jun 17, 2019).
As for the sound - from the horse's mouth, "For dvd it’s stereo 2.0. For Blu-ray it’s stereo PCM and DTS 5.1. Many thanks, Acorn DVD" (3:15 PM · Jun 17, 2019).
Further details and comparison between this and the US release:-
It's been mentioned that the steelbook artwork looks like a video game cover . . . I reckon that comment is more appropriate to the German mediabook:-
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