In 1979 Ashley Jansen was a member of the Reading Apollo team that won the South of England Shotokan tournament and this achievement was repeated again in 1980. Ashley moved to Sydney Australia and trained under  Takahashi Sensei from the Japan Karate Association. While in Australia Ashley was runner up in the New South Wales JKA State tournament and opened a Dojo on Bondi Beach. Under Ashley’s instruction students from the Bondi Dojo won state and national tournaments in kata and kumite. While in Australia Ashley started training under Yoshikazu Sumi Sensei 8th dan JKA and still continues his study of martial arts under Sumi Sensei.

Ashley returned to the United Kingdom in 1984 having travelled around the world studying martial arts. In 1989 the Windsor Dojo was opened and in June 1993 Ashley was awarded the title of Sensei (Teacher) and the grade of 5th dan from  Sumi Sensei. In October 2009 Sumi Sensei together with the Committee of the School of Traditional Karate awarded Ashley the rank of 6th Dan and in September 2021 Ashley was promoted to 7th Dan for his services within the association.

Ashley Jansen studies Ryukyu Kobujutsu under the instruction of Julian Mead Sensei and holds the rank of 4th Dan in Kobujutsu.

In 2016 Ashley won the Ryukyu Kobujutsu GB National Kata Tournament