*Co-operative Party candidates stand jointly with the Labour Party. †Sinn Féin have elected members and offices at Westminster, but as abstentionists do not take their seats.
To restrict this template to a manageable size, only extant notable political parties active in the United Kingdom should be listed. Notability for the "Other national and regional parties" section can be established by:
having MEPs, MPs, MSPs, or assembly members within the last 5 years;
having elected representation in at least two geographically separate local council areas above parish level;
gaining more than 5,000 votes in any election in the United Kingdom in the last 5 years.