United Kingdom

The Bill of Rights states:

…That election of members of Parliament ought to be free…

Excerpt from An Act Declaring the Rights and Liberties of the Subject and Settling the Succession of the Crown (1688)

Part I, article 1 states:

(1) A person is entitled to vote as an elector at a parliamentary election in any constituency if on the date of the poll he

• (a) is registered in the register of parliamentary electors for that constituency,
• (b) is not subject to any legal incapacity to vote (age apart),
• (c) is either a Commonwealth citizen or a citizen of the Republic of Ireland, and
• (d) is of voting age (that is, 18 years or over).

Excerpt from the Representation of the People Act (1983, last amended 2013)