In the House of Commons most of the legislation is introduced by the Government - and it enjoys control of the majority of time available. However, on thirteen Fridays each session time is allocated for the consideration of Private Members Bills (PMBs). During the first seven Fridays priority is given to the Second Reading of PMBs and the remaining six to Report Stages; Third Readings and Lords Amendments.At the start of each session a ballot is held - and the lucky backbenchers who are chosen get the opportunity to introduce a bill of their choice. Further details of PMBs can be found at http://www.parliament.uk/DOCUMENTS/UPLOAD/L02.PDF
The ballot is not the only way for a member to gain an opportunity to introduce proposed legislation. The 'Ten Minute Rule Bill' procedure gives an MP a prime time spot to ask for leave to introduce a bill - though this is often used to publicise an issue rather than to bring in legislation. MPs can also present a bill, but no time is given for further stages.
