There was a three-part documentary on the BBC earlier last year which is very similar and features many of the same or similar interviews and interviewees, but it has a slightly different focus to the Netflix doc. I just looked and it is currently unavailable on iPlayer, sadly BBC Four - The Yorkshire Ripper Files: A Very British Crime Storyis it me or is it essentially the same as the ITV/CH4 documentary?
Both are very good.