| Leeds North West (1950) |
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| Leicester North East (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Leicester North West (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Leicester South East (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Leicester South West (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Lewisham North (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Lewisham South (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Leyton (1950 - 1997) |
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| Lichfield and Tamworth (1950 - 1983) |
Full name (in Craig 4) Staffordshire, Lichfield and Tamworth |
| Liverpool, Garston (1950 - 2010) |
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| Liverpool, Toxteth (1950 - 1983) |
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| Llanelli (1950) |
Full name (in Craig 4) Carmarthenshire, Llanelli. Spelled Llanelly between 1918 and 1950 - not strictly a new seat in that year. |
| Manchester, Cheetham (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Manchester, Wythenshawe (1950 - 1997) |
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| Meriden (1950 - 2024) |
Full name (in Craig 4) Warwickshire, Meriden |
| Merthyr Tydfil (1950 - 1983) |
Constituency of same name also existed 1832-1918. |
| Merton and Morden (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Midlothian and Peeblesshire (1950 - 1955) |
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| Mid-Ulster (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Probably the same constituency as Ulster Mid (q.v.) - difference in terminology between Craig and Times sources. |
| Morecambe and Lonsdale (1950 - 1983) |
Full name (in Craig 4) Lancashire, Morecambe and Lonsdale |
| Nantwich (1950 - 1983) |
Full name (in Craig 4) Cheshire, Nantwich |
| New Forest (1950 - 1997) |
Full name (in Craig 4) Hampshire, New Forest. Constituency of same name also existed 1885-1918. |
| Norfolk Central (1950 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Norfolk North (1950) |
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| Norfolk South (1950) |
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