From Law wiki, the wiki for law research

A Bill is a proposed new piece of legislation that will, if it is accepted by Parliament, become a Statute (see: Legislative process). Most Bills are introduced by Government ministers, and these occupy the largest proportion of Parliamentary time. However, sometimes a Private bill or a Private members bill can succeed and become law. Government Bills are usually introduced into Parliament in the form that the Government wishes to see enacted; they are therefore carefully drafted, usually after a period of consultation (see: Formulation of bills).