Thank you Sean.. and Abasan for your replies...
You are correct Sean, our reference to the Hombu was intended to mean the Yoshinkan Hombu.
Chida, Tsutomu
Rank: 8th dan, Shihan (Yoshinkan)
Dojo: Aikido Yoshinkan Hombu Dojo
3F Takayama Building
2-28-8 Kami-Ochiai
Shinjuku-ku Tokyo 161
Japan
Note: Speeelling corrections are on their way.