in 1998, harrison returned to the diocese of southwark. he was vicar of holy trinity, eltham, between 1998 and 2006. from 2005 to 2006, he also served as rural dean of eltham and mottingham. he then moved to the diocese of leicester where he has served as the director of ministry and mission from 2006 to 2016; in this role his duties include "growing the mission of local parishes ... developing missional leadership, pioneer ministry and fresh expressions of church". in 2006, he was made an honorary canon of leicester cathedral.