Here I have a scan from "American Helicopter" magazine, December 1945, page 19, about the Landgraf Model H-2. I had to upload to Imageshack for a better resolution.
Firth FH-1 (FH-01/4) (G-ALXP) - Twin-rotor helicopter using a Planet Satellite fuselage. It was based on patents by Landgraf and would have accommodated roughly the same number of passengers as the H-3. It was presented to the College of Aeronautics at Cranfield in 1955. Development ceased due to technical problems with excessive weight on the rotors and limited financial resources to investigate solutions.