Was he a Chartered Accountant or a Chartered Certified Accountant? If so, you can contact the professional bodies and complain. The addresses are as follows:
Institute of Chartered Accountants Chartered Accountants Hall, Moorgate Place, London, EC2R 6EA Tel: 020 7920 8100
Association of Chartered Certified Accountants
29, Lincoln's Inn Fields, London, WC2A 3EE Tel: 020 7059 5000