The Cabinet Office has a paper on conventions which may be relevant in the event of a hung parliament. It is available at -
http://www.cabinetoffice.gov.uk/media/343763/election-rules-chapter6-draft.pdf
For everyone interested in History and also the work of Britain's Parliament; the US Congress; the European Parliament and the French Parlement. Also deals with China and the European Union. Discusses Practice, Procedure, History and current issues.