In the second season, DI Cazenove took control of the Krays case, in the 60s both Ronnie and Reggie lived in Cedra Court, which is on Cazenove road.
The Met don't use interview rooms with two way mirrors. That's an Americanism.
The BBC U.S. DVD release under the box title of "Whitechapel: The Ripper Returns" features the first three episodes with a running time of 136 minutes. The program on the disc gives the title as simply "Whitechapel."