Voting: 23-02-1950
- Anti-Partition (4 elections)
- Christian Democrat (1 election)
- Communist (100 elections)
- Conservative (498 elections)
- Conservative and National Liberal (26 elections)
- Independent (6 elections)
- Independent Conservative (4 elections)
- Independent Labour (6 elections)
- Independent Labour Party (5 elections)
- Independent Liberal (1 election)
- Independent Republican (2 elections)
- Independent Scottish Nationalist (1 election)
- Independent Welsh Nationalist (1 election)
- Irish Labour (2 elections)
- Labour (576 elections)
- Labour Co-op (35 elections)
- Liberal (475 elections)
- Nationalist Party of Northern Ireland (1 election)
- National Liberal (3 elections)
- National Liberal and Conservative (25 elections)
- NI Labour (5 elections)
- Plaid Cymru (8 elections)
- Scottish Home Rule (2 elections)
- Scottish Self-Government (1 election)
- Scottish Unionist (58 elections)
- Sinn Féin (1 election)
- SNP (4 elections)
- Social Credit (1 election)
- Socialist (GB) (2 elections)
- Speaker (1 election)
- United Socialist Movement (1 election)
- UUP (12 elections)