| Berwickshire and Haddingtonshire (1918 - 1950) |
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| Birkenhead East (1918 - 1950) |
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| Birkenhead West (1918 - 1950) |
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| Birmingham, Acock's Green (1918 - 1950) |
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| Birmingham, Aston (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Birmingham, Deritend (1918 - 1950) |
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| Birmingham, Duddeston (1918 - 1950) |
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| Birmingham, Erdington (1918 - 1955) |
Constituency of same name reformed in 1974ยน. |
| Birmingham, Handsworth (1918 - 1983) |
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| Birmingham, King's Norton (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Birmingham, Ladywood (1918) |
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| Birmingham, Moseley (1918 - 1950) |
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| Birmingham, Sparkbrook (1918 - 1997) |
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| Birmingham, Yardley (1918) |
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| Blaydon (1918 - 2024) |
Full name (in Craig 3,4) Durham, Blaydon |
| Bothwell (1918 - 1983) |
Full name (in Craig 3,4) Lanarkshire, Bothwell |
| Bournemouth (1918 - 1950) |
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| Bradford North (1918 - 2010) |
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| Bradford South (1918) |
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| Breconshire and Radnorshire (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Brentford and Chiswick (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 3) Middlesex, Brentford and Chiswick |
| Bristol Central (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Bromley (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Broxtowe (1918 - 1955) |
Full name (in Craig 3,4) Nottinghamshire, Broxtowe. Constituency of same name reformed 1983. |
| Bute and Northern Ayrshire (1918 - 1950) |
Full name (in Craig 3) Ayrshire and Bute, Bute and Northern |