Bills
A Bill is a draft law. It needs to be approved in the Houses of Parliament and receive Royal Assent before it becomes an Act of Parliament.
As explained by Cite them right Bills from the House of Commons or House of Lords, the type of information you need to include in your reference list is as follows: Title (year of publication). Parliament: House of Commons OR Parliament: House of Lords. Bill no.[ ]. Place of publication: publisher.
In-text citation: The Sugar in Food and Drinks (Targets, Labelling and Advertising) Bill (2016) had its first reading on....
Reference list: Sugar in Food and Drinks (Targets, Labelling and Advertising) Bill (2016). Parliament: House of Commons. Bill no. 70. London: The Stationery Office.