As Chairman of the House of Commons the Speaker is sometimes required to interpret the rules of procedure in the House.
These Speaker's rulings form a part of the procedures of the House of Commons and create precedents by which future Speakers, members and officers of the House are guided.
When a ruling is asked for by an MP during a point of order, the Speaker may either give an instant ruling or consider the matter further and write to the member.
Members can also go to the Speaker and ask for a ruling in private rather than raise it in the chamber of the House.
There is no equivalent procedure in the House of Lords where the Lord Speaker or chairman cannot give rulings.