8th Dan, Shito Ryu Karate
Other Arts - Iai, jujutsu, taichi, Okinawan kobudo.


Sei Iwasa was born in Nagasaki, in May 11, 1955. He began practicing karate in 1967 with the late sensei Eiji Ogasahara 10th dan, who was a personal student of Kenwa Mabuni (the legendary founder of Shito Ryu Karate).

He served as the president of the World United Karate Organisation, WUKO&AD until 2019 and is the head of the Japan Kenshukai Karate Association (JKKA). Master Iwasa moved to Europe in 1981 and alongside jujutsu master Yuji Matsuoi, he founded the Seiken Shudo Kai cultural association to promote Japanese martial arts and culture.


Jikan Dojo Chief Instructor, sensei Jacob frequently visits Master Iwasa to receive direct teaching.


8th Dan, Shito Ryu Karate (Tani-ha)

7th Dan, Okinawan Shorin Ryu Karate (Kobayashi)

6th Dan, Wado Ryu Jujutsu Kempo


Sensei Derek Ridgeway is the founder of the now worldwide association Kazoku Kai International. As well as teaching in his Hombu dojo, Sensei Ridgway travels across the globe to teach Karate to an ever growing family of Karate-Ka.

Kazokukai broadly translates to mean 'family' and the feeling experienced by members truly reflects this. The warm and friendly 'Sensei Derek' is himself a living legend with an encyclopedic knowlegde of over 90 well known traditional kata(Shito Ryu, Shorin Ryu & Wado Ryu). A retired Electrical engineer he is a master of Shito Ryu Karate-do having studied for many years under Keiji Tomiyama amongst other masters and more recently the higest graded European in Okinawan Karate(Shorin Ryu), under the tutelage of Okinawan Grandmaster Isamu Arakaki, 10th Dan.


Jikan Dojo is a member of Kazokukai enjoying a healthy relationship with traditional Okinawan and Japanese Karate clubs across Britain. Through participation in association events member clubs all gain tremendously from exposure to traditional styles such as Shito Ryu, Wado Ryu, Shotokan, Ryu Kyu Kubudo(weapons) and Okinawan Shorin Ryu.

Our technical directors are the headmasters of our parent organisations. The are direct teachers of our Chief Instructor and have authorised our school to represent them and their teachings.