Well, I recently watched this, and it was interesting to see Stewart Evans, Mike Hawley, and the Whitechapel Society of 1888 at a gathering. Pat Spain led us to the various accessible sites of the murders, construction work and all, went to the JtR Musuem for more info on the C5, briefly looked at (and dismissed) Walter Sickert, visited a meeting of the Whitechapel Society which featured a mock trial of Dr Gull, interviewed Mr. Evans, and then talked to Mr. Hawley re Tumblety as a suspect.
The rest of the program focused on a handwriting analysis of a letter by Tumblety, as well as the newly discovered postcard purportedly by JtR which refers to a "student's knife". He took a copy of the latter with the signature masked back to his handwriting expert for comparison, and she declared them to be by the same person.
What is the provenance of the postcard? I am not familiar with it.
--------------- Von Konigswald: Jack the Ripper plays shuffleboard. -- Happy Birthday, Wanda June by Kurt Vonnegut, c.1970.