- The Police Federation and Superintendents' Association
- Lawyers in matters relating to the Solicitors' Regulation Authority
- Barristers in relation to matters before the Bar Council
- Doctors and surgeons in relation to matters before the General Medical Council and in dealing with the BMA
- Accountants and the Institute of Chartered Accountants
- Financiers, directors and officers, independent financial advisors and the Financial Service Authority
- Courts Marshall Proceedings before the Military courts
- Directors involved in Health and Safety prosecutions
- Cartel investigations
- Investigations into mergers, market shares and conditions
- Corporate manslaughter
- Public inquiries.