Jeremy (aged 50) has mobility problems and finds it difficult to leave his house. He appointed his brother Norman (aged 45) to hold his enduring power of attorney (EPOA). As the EPOA was made effective immediately upon signing, Norman has been using it to do Jeremy's banking and liaise with Centrelink and Jeremy's superannuation fund, and manage his investment property. However, the brothers have had a falling out and Jeremy wants to end this arrangement. What is the most effective way for Jeremy to revoke this EPOA