Some discussion in the Retirements thread about those MPs who served a single term by choice. I think the list is this:
1945Max Aitken (C, Holborn)
John Battley (Lab, Wandsworth, Clapham)
Albert Bechervaise (Lab, Leyton, East) - affected by boundary changes
Geoffrey Clifton-Brown (C, Bury St Edmunds)
Thomas Loftus Cole (UU, Belfast, East)
Dr Louis Comyns (Lab, West Ham, Silvertown) - affected by boundary changes
Dr John Corlett (Lab, York)
Walter Farthing (Lab, Frome)
Eric Gandar-Dower (C turned Ind, Caithness and Sutherland)
Edgar Grierson (Lab, Carlisle)
Samuel Haughton (UU, Antrim)
Arthur Howard (C, Westminster, St George's) - affected by boundary changes
Sydney Lavers (Lab, Barnard Castle) - affected by boundary changes
Benn Levy (Lab, Eton and Slough)
William McAdam (Lab, Salford, North) - affected by boundary changes
Sir Noel Mason-Macfarlane (Lab, Paddington, North) - resigned 1946
Hubert Medland (Lab, Plymouth, Drake) - affected by boundary changes
Sir William Neill (UU, Belfast, North)
Henry Nicholls (Lab, West Ham, Stratford) - affected by boundary changes
Wesley Perrins (Lab, Birmingham Yardley)
Oliver Poole (C, Oswestry)
Edward Porter (Lab, Warrington)
Hon. Simon Ramsay (C, Forfarshire)
Richard Sargood (Lab, Bermondsey, West) - affected by boundary changes
Granville Sharp (Lab, Spen Valley)
Christopher Shawcross (Lab, Widnes)
Sydney Smith (Lab, Kingston-upon-Hull, South-West) - affected by boundary changes
John Thomas (Lab, Dover)
George Walker (Lab, Rossendale)
Tom Williamson (Lab, Brigg) - resigned 1948
Edith Wills (Lab, Birmingham, Duddeston) - affected by boundary changes
1950Jack Cooper (Lab, Deptford)
Nigel Davies (C, Epping)
1951Patricia Ford (UU, North Down) - elected in 1953 byelection
Michael O'Neill (N, Mid-Ulster)
Sidney Schofield (Lab, Barnsley) - resigned 1953
1955Denis Keegan (C, Nottingham, South)
1959Percy Browne (C, Torrington)
John Jackson (C, South-Eastern Derbyshire)
Commander John Kerans (C, The Hartlepools)
Alan Thompson (Lab, Dunfermline Burghs)
1964None
1966James Davidson (L, West Aberdeenshire)
1970Richard Leonard (Lab, Romford)
Frank Marsden (Lab, Liverpool, Scotland) - elected 1971; affected by boundary changes
Colin Mitchell (C, West Aberdeenshire)
David Reed (Lab, Sedgefield) - affected by boundary changes
1974 (F)None
1974 (O)None
1979Thomas Benyon (C, Abingdon)
Sheila Faith (C, Belper)
Helen McElhone (Lab, Glasgow, Queen's Park) - elected 1982; affected by boundary change
Andy McMahon (Lab, Glasgow, Govan) - affected by boundary change
John McQuade (UDUP, Belfast, North)
Reg Race (Lab, Wood Green) - affected by boundary change
Keith Wickenden (C, Dorking)
Sheila Wright (Lab, Birmingham, Handsworth) - affected by boundary change
1983None
1987Alan Amos (C, Hexham)
1992Hartley Booth (C, Finchley) - affected by boundary change
Michael Stephen (C, Shoreham) - affected by boundary change
Roy Thomason (C, Bromsgrove)
1997Donald Gorrie (L Dem, Edinburgh, West)
Jenny Jones (Lab, Wolverhampton, South West)
Tess Kingham (Lab, Gloucester)
Alasdair Morgan (SNP, Galloway and Upper Nithsdale)
John Swinney (SNP, Tayside North)
2001None
2005Jim Devine (Lab, Livingston) - elected 2005 byelection
David Howarth (L Dem, Cambridge)
Kitty Ussher (Lab, Burnley)
2010Aidan Burley (C, Cannock Chase)
Dan Byles (C, North Warwickshire)
Lorraine Fullbrook (C, South Ribble)
Chris Kelly (C, Dudley, South)
Jessica Lee (C, Erewash)
Louise Mensch (C, Corby) - resigned 2012
Laura Sandys (C, South Thanet)
Ian Swales (L Dem, Redcar)
Mike Weatherley (C, Hove)
2015David Mackintosh (C, Northampton South)
Natalie McGarry (SNP turned Ind, Glasgow East)
Michelle Thomson (SNP turned Ind, Edinburgh West)
2017Bill Grant (C, Ayr, Carrick and Cumnock)
Barry McElduff (SF, West Tyrone) - resigned 2018
Jared O'Mara (Lab turned Ind, Sheffield Hallam)
Ross Thomson (C, Aberdeen South)