Guy is joint author of Butterworth's Financial Reporting and Accounting Service and a member of the lecturing panels for the Institute of Chartered Accountants in England and Wales and the Chartered Association of Certified Accountants. He specialises in Auditing and Financial Reporting updates for accountants in practice and industry, and in Finance courses for members of the wider financial community. He also provides a consultancy service to assist companies in preparing their annual financial statements. He is a Director of PTP Ltd.