Temporary committees set up to investigate and report on one specific area of law. They are made up of a wide cross-section of people with expertise and/or an interest in the subject area. The chairman is often a senior judge, and the commission is usually referred to by the name of the chairman, such as the Runciman Commission .
Once the report is made, the commission will be disbanded. Some Royal Commissions have led to major changes in the law. For example, the Royal Commission on Police Procedure (the Phillips Commission), which reported in 1981, had many of its recommendations made law in the Police and Criminal Evidence Act 1984 .