Subsidiary legislation, also referred to as delegated legislation is the law that is brought into being by authorities, persons or bodies other than Parliament, under power conferred by either the Constitution or Parliament. The purpose and limits of such subsidiary or subordinate law making powers will normally be set out in the enabling Act of Parliament or the Constitution.
There are several reasons why it is necessary to have subsidiary legislation:
1. Pressure on Parliamentary time
Parliament barely has the time to discuss the essential principles of a Bill. Much time can be saved and amendments to Acts obviated, by delegating the consideration of procedure and subordinate matters to ministers and their departments
2. Technicality of subject matter
The subject matter of modern legislation is often highly technical. Technical matters, as distinct from broad policy, are not susceptible to discussion in Parliament and therefore cannot be readily included in a Bill. Delegation to ministers enables them to consult expert advisers and interested parties while the regulations are still in the draft stage
3. Flexibility
In large and complex measures it is not possible to foresee all the contingencies and local conditions for which provisions will have to be made, and it would be difficult to settle all the administrative machinery in time for insertion in the bill. Delegated legislation provides a degree of flexibility, as changes can be made from time to time in the light of experience without the necessity for a series of amending Acts.
4. Emergency powers
In emergencies such as war, serious strikes and economic crises, there would often not be time to pass Acts of Parliament even if (as may not be the case) Parliament is sitting. The executive, in such circumstances, is empowered to make regulations to deal with the emergency at hand
There are several types of subsidiary legislation, all of which are published in the Government