the win in italy was followed by success at home when harrison defeated dutch-based kickboxer mohamed ajuou to claim the european version of the s.i.m.t.a. belt. in following fights harrison beat abdoulaye m'baye and benzouaoua hakim as well as hiromasa masuda in a rematch from 2003 and was still undefeated into 2005. he made his thai debut in august of that year, losing a split decision to witthayanoi sitkuanem at rajadamnern stadium in what was the first defeat of his pro career. harrison suffered a second consecutive loss a few months later on his return to england, losing to another thai in duwao kongudom who was a highly rated omnoi stadium champion, in a match in wolverhampton.