This is a list of missing civil parishes, it was drawn up in 2014, with subsequent additions and was derived from many sources, there are probably some that aren't actually CPs, or are just alternative names.
Abdon and Heath
Affpuddle and Turnerspuddle
Aldborough & Thurgarton
Aldborough and Thurgarton (same as Aldborough & Thurgarton)
Aldford and Saighton
Alpraham and Calveley
Ashton Hayes and Horton-cum-Peel
Bandleyside (partly exists) (just a parish council http://www.cwherald.com/a/archive/25-years-orton.280567.html)
Bardon (parish)
Barnham and Eastergate
Barwick and Stotford
Biddestone and Slaughterford
Bishop Thornton, Shaw Mills and Warsill
Bitteswell with Bittesby
Bottesford (town) (exists)
Bowness, Allerdale
Brandon Parva, Coston, Runhall and Welborne
Brant Broughton and Stragglethorpe
Braunstone, Blaby
Brenchley and Matfield
Brington and Molesworth
Broughton Hamlet (exists)
Bulkeley and Ridley
Bull Fort (apparently no longer a CP per Talk:Civil parishes in Cornwall from after 1974)
Burgh le Marsh (town) (exists)
Burland and Acton
Burley, Bradford
Burton and Winkton
Caistor St Edmund and Bixley
Caistor (town) (exists)
Campbell Park (parish) (exists)
Cantley, Limpenhoe and Southwood
Careby, Aunby and Holywell (exists)
Carlton le Moorland (exists)
Carrington and New Bolingbroke
Castle Carrock and Geltsdale (partly exists) (Castle Carrock is a separate parish, Geltsdale appears not to be a parish anymore)
Chapel Ascote
Chard Town (parish)
Checkley, Staffordshire (exists)
Chelmer, Essex
Chelmsford Garden
Chetwynd Aston and Woodcote
Chipping Warden and Edgcote
Clarendon Park (parish)
Claxby with Moorby
Cley Next The Sea (exists)
Coneythorpe and Clareton
Coningsby (town) (exists)
Cotton, Staffordshire Moorlands (Cotton, Staffordshire is different to Coton, Staffordshire https://en.wikipedia.org/w/index.php?title=Cotton,_Staffordshire&diff=prev&oldid=552215929) (exists)
Cradley and Storridge
Cranbrook & Sissinghurst
Cranwell and Byard's Leap (maybe same as Cranwell, Brauncewell and Byard's Leap)
Cranwell & Byards Leap (same as Cranwell and Byard's Leap)
Cranwell, Brauncewell and Byard's Leap
Cranwell, Byards Leap & Brauncewell (same as Cranwell, Brauncewell and Byard's Leap)
Creeting St Peter or West Creeting (same as Creeting St. Peter or West Creeting)
Crichel (parish) (exists)
Crowle and Ealand
Cuddington, Malpas
Culverthorpe and Kelby
Dadlington and Sutton Cheney
Delamere and Oakmere
Doddington and District
Doddington and Whisby
Donnington and Muxton
Drakes Broughton and Wadborough
Duddington-with-Fineshade
Dunham-on-the-Hill and Hapsford
Dunkerton and Tunley
East and West Newbiggin
Eastleigh Town (exists)
Easton (parish), Wiltshire
Eastville, Linconlshire (exists) (typo of dab (Lincolnshire), Eastville, Lincolnshire)
Eaton and Eccleston
Edmondbyers
Egglestone Abbey (parish)
Ellerton Abbey (parish) (exists)
Ellington and Linton
Evenlode, Gloucestershire (exists)
Evenwood and Barony
Ewart, Northumberland
Fairfields, Buckinghamshire (exists)
Far Cotton & Delapre
Forcett and Carkin (no longer a parish)
Fylingdales Moor (same as Lands common to Fylingdales and Hawsker-cum-Stainsacre)
Gainsborough (town) (exists)
Garthorpe and Fockerby
Garton, East Riding of Yorkshire
Garvestone, Reymerston and Thuxton
Gayton Le Marsh (exists)
Gayton Le Wold (exists)
Givendale
Glenfields, Leicestershire
Goole Township
Grange De Lings (exists)
Graveney with Goodnestone
Great Ribston with Walshford
Greatworth and Halse
Greencroft (parish)
Grimston, Saxelbye and Shoby (partly exists) (maybe not a parish, Grimston, Leicestershire is a separate parish according to Pastscape)
Grindon and Thorpe Thewles
Hadley and Leegomery (same as Hadley & Leegomery)
Hadley & Leegomery
Hamsterley Common (same as Land common to Hamsterley, Lynesack and Softley and South Bedburn)
Hanham Abbots
Hargrave and Huxley
Harlestone Manor
Harpenden Town (parish)
Hartleyburn
Hauxley
Hawerby cum Beesby
Haworth and Stanbury
Haydon, Northumberland
Hedgeley
Hedleyhope (parish)
Hertsmere Meriden
Hetton, Tyne and Wear
Hexhamshire (parish)
Hill, South Gloucestershire (exists)
Hilton, South Staffordshire
Hinton, Dorset
Hinton-in-the Hedges (exists)
Hodnell and Wills Pastures
Hoe and Worthing
Holbrook Farm, Wiltshire (same as Lands common to the parishes of Broughton Gifford and Melksham Without, Holbrook Farm appears to only be used on Wikipedia)
Hollinghill
Hollinswood and Randlay
Holme Next the Sea (exists)
Holton Le Moor (exists)
Holywell cum Needingworth (same as Holywell-cum-Needingworth)
Holywell-cum-Needingworth
Hope, County Durham
Hopton and Coton
Horncastle (town) (exists)
Hough and Chorlton
Hough on the Hill (exists)
Houghton Le Side (exists)
Huddleston with Newthorpe
Hulland (east)
Hunsbury Meadows
Hutton-Sessay (exists)
Ilton-cum-Pott (Ilton cum Pott is a redirect)
Immingham (town) (exists)
Isle of Man, Devon (same as Lands common to Axminster and Kilmington, Isle of Man appears to only be used on Wikipedia)
Keadby with Althorpe
Kemble and Ewen
Kenwyn (parish)
Kettering Town (parish) (OS only shows it covering a small area east of the town)
Kettleshulme and Lyme Handley
Kimblesworth and Plawsworth
Kimbolton and Stonely (partly exists) (Kimbolton, Cambridgeshire is apparently a separate parish even though name apparently changed in 2003)
Kingston Near Lewes (exists)
Kingston Russell (parish) (exists)
Kirby Hall, North Yorkshire
Kirkby La Thorpe (exists)
Kirkby Mallory, Peckleton and Stapleton
Kirkby Wharfe with North Milford
Kirmond Le Mire (exists)
Knossington and Cold Overton
Lach Dennis and Lostock Green
Land common to Hamsterley, Lynesack and Softley and South Bedburn
Lands cmn to the parishes of Brancepeth and Brandon and Byshottles
Lands Common to Axminster and Kilmington (exists)
Lands Common to Axminster and Kilmington C.P.s (exists)
Lands Common to Axminster and Kilmington C.P. s (exists)
Lands common to Bridestowe and Sourton CP's (exists)
Lands common to Fylingdales and Hawsker-cum-Stainsacre
Lands common to Holme Abbey, Holme Low and Holme St Cuthbert
Lands Common to Holme Abbey, Holme Low and Holme St Cuthbert (same as Lands common to Holme Abbey, Holme Low and Holme St Cuthbert)
Lands common to the Parishes of Axminster and Kilmington (exists)
Lands common to the Parishes of Axminster and Kilmington, Lands common to the Parishes of Bridestowe and Sourton, Landulph (2 CPs)
Lands common to the Parishes of Bridestowe and Sourton, Landulph
Lands common to the parishes of Broughton Gifford and Melksham Without (same as Lands common to the parishes of Broughton Gifford and Melksham without)
Lands common to the parishes of Broughton Gifford and Melksham without
Langleydale and Shotton
Langton By Spilsby (exists)
Langton By Wragby (exists)
Lawley and Overdale
LCPs of Brancepeth and Brandon and Byshottles (same as Lands cmn to the parishes of Brancepeth and Brandon and Byshottles)
LCPs of Broughton Gifford and Melksham Without (same as Lands common to the parishes of Broughton Gifford and Melksham without)
LCPs of Fylingdales and Hawsker-cum-Stainsacre (same as Lands common to Fylingdales and Hawsker-cum-Stainsacre)
LCPs of Hamsterley, Lynesack and Softley, and South Bedburn (same as Land common to Hamsterley, Lynesack and Softley and South Bedburn)
LCPs of Holme Abbey, Holme Low and Holme St Cuthbert (same as Lands common to Holme Abbey, Holme Low and Holme St Cuthbert)
LCPs of Stanhope, Wolsingham and Tow Law (same as Wolsingham Park Moor lands cmn to Stanhope, Tow Law and Wolsingham)
Lead, North Yorkshire
Lea Hall, Derbyshire (not a parish anymore)
Leek Wootton and Guys Cliffe (exists)
Lenton Keisby and Osgodby (exists)
Letton, central Herefordshire
Lilford-cum-Wigsthorpe
Lilleshall and Donnington (now Lilleshall, Donnington and Muxton)
Lilleshall, Donnington and Muxton
Lindrick with Studley Royal and Fountains
Linton, Bringsty (exists)
Little Bollington with Agden
Little Hadham, Hertfordshire (exists)
Loughton & Great Holm (exists)
Louth (town) (exists)
Lower Hardres and Nackington
Luddington and Haldenby
Lusby with Winceby
Luttons
Lynesack and Softley
Lynsted with Kingsdown
Mablethorpe and Sutton (town) (exists)
Marbury and District
Mareham Le Fen (exists)
Market Deeping (town) (exists)
Market Rasen (town) (exists)
Marston, Staffordshire (exists)
Melchet Park and Plaitford
Michelmersh and Timsbury
Mickle Trafford and District
Middleton, East Riding of Yorkshire
Millington and Rostherne
Milstead and Kingsdown (no longer exists)
Morton, South Kesteven (now Morton & Hanthorpe)
Morton & Hanthorpe (exists)
Nesbitt, County Durham
Nesfield with Langbar
Newbold Pacey and Ashborne (partly exists) (not a CP)
Newsham, County Durham
Newton, Ryedale
Newton By Malpas (exists)
Newton-on-the-Moor and Swarland
Newton Kyme cum Toulston
No Man's Heath and District
Normanby By Spital (exists)
Normanby Le Wold (exists)
Normanton Le Heath (exists)
Normanton on the Wolds (exists)
North Hykeham (town) (exists)
North Lodge, County Durham
Norton and Lenwick (does it exist?, maybe actually Norton and Lenchwick)
Nursling and Rownhams
Oldbury-upon-Severn (exists)
Old Basing and Lychpit
Old Hutton and Homescales (same as Old Hutton and Holmescales, typo)
Old Stratford and Drayton
Osmotherly (exists) (same as Osmotherley, Cumbria, typo)
Outseats (no longer a parish)
Pattingham and Patshull
Pen Selwood
Peover Superior and Snelson
Pilning and Severn Beach
Plenmeller with Whitfield
Portland (parish)
Poulton and Pulford
Preston, Dover (exists)
Pudlestone
Raby with Keverstone
Radbourn, Warwickshire
Radbourne, Warwickshire (same as Radbourn, Warwickshire)
Randwick and Westrip
Ratley and Upton
Rigsby with Ailby
Rosedale East Side
Rosedale West Side
Ross Rural
Roxholm
Ruspidge and Soudley
Saughall and Shotwick Park
Scalthwaitrigg (exists) (same as Scalthwaiterigg, typo)
Seaton with Slingley
Sevington with Finberry
Shelford and Newton (no longer a parish)
Sheraton with Hulam
Sherburn Village
Shotley Low Quarter
Shotton (parish) (same as Shotton (parish, near Peterlee)
Shotton (parish, near Peterlee)
Sixpenny Handley and Pentridge
Skegness (town) (exists)
Skidbrooke with Saltfleet Haven
Skinburness Marsh (same as Lands Common to Holme Abbey, Holme Low and Holme St Cuthbert)
Slanford with Orleton (maybe Stanford with Orleton?)
Slangford with Orleton (doesn't appear to exist)
Sleaford (town) (exists)
Smalley (parish) (exists)
South Cadbury and Sutton Montis
South Lenches
South Mimms and Ridge
South Ormsby cum Ketsby
South Tedworth (not a parish anymore, see User:Morwen/parish delta) (maybe a typo of South Tidworth in the census as it is South Tidworth on the Ordnance Survey and North Tidworth is even North Tidworth in the census, see also List of civil parishes in Wiltshire where this assertion has also been made)
South Trumpington
South Willesborough & Newtown (same as South Willesborough and Newtown)
South Willesborough and Newtown
Spilsby (town) (exists)
Stamford (town) (exists)
St Andrews, Swindon
St. Andrews, Swindon (same as St Andrews, Swindon)
Stanton, Derbyshire Dales
Stapeley and District
St. Blaise, Cornwall
St Cosmus and St Damian in the Blean (St. Cosmus and St. Damian in the Blean is on redirects)
St. Cross, South Elmham (exists)
St. Devereux
St. Giles on the Heath (exists)
St. Helens, Isle of Wight (exists)
St. James, South Elmham (exists)
St. John, Ilketshall (exists)
St Keyne and Trewidland
St. Lawrence, Ilketshall (exists)
St. Leonards and St. Ives
St. Margarets, Herefordshire (exists)
St. Margaret's at Cliffe (exists)
St. Margaret, South Elmham (exists)
St Mary, South Elmham Otherwise Homersfield (exists)
St. Mary, South Elmham Otherwise Homersfield (exists)
St Devereux (same as St. Devereux)
St. John's Castlerigg and Wythburn (exists)
St. Michael, Hertfordshire (exists)
St. Michael, South Elmham (exists)
St. Neots Rural
St. Nicholas at Wade (exists)
St. Paul Malmesbury Without (exists)
St. Peter, South Elmham (exists)
St. Weonards (exists)
Stanthorne and Wimboldsley
Stanton on the Wolds (exists)
Staunton Coleford (exists)
Steeple with Tyneham
Stillington and Whitton
Stirchley and Brookside
Stock and Bradley
Stoke, Worcestershire
Stoke and Hurleston
Stoke Lodge and The Common
Stonebow Village
Stow Bedon and Breckles
Streatlam and Stainton
Stubbs Walden
Sturton By Stow (exists)
Stutton with Hazlewood
Sutton, Bassetlaw
Sutton, Craven
Sutton-by-Dover (exists)
Tattenhall and District
Teddesley Hay
Temple Cloud with Cameley
The Charltons
The Moultons
Thirlwall, Northumberland
Thirston
Thornton Le Fen (exists)
Thornville, North Yorkshire
Thorpe By Water (exists)
Thriplow and Heathfield
Thwaite, South Norfolk
Tilehurst (parish)
Tilton on the Hill and Halstead
Tiverton and Tilstone Fearnall
Tregony with Cuby
Tretire (appears not to be a parish)
Trimdon Foundry
Tritlington and West Chevington
Upton and Coppingford
Upwood and the Raveleys
Utkinton and Cotebrook
Wainfleet All Saints (town) (exists)
Walcot near Folkingham (exists)
Walcot Near Folkingham (same as Walcot near Folkingham)
Walkingham Hill with Occaney
Waltham and Thorpe Arnold (same as Waltham on the Wolds and Thorpe Arnold)
Waltham on the Wolds and Thorpe Arnold
Waresley cum Tetworth (same as Waresley-cum-Tetworth)
Waresley-cum-Tetworth
Weather Hill Wood (same as Lands cmn to the parishes of Brancepeth and Brandon and Byshottles Weather Hill Wood appears to only be used on Wikipedia)
Wells-Next-the-Sea (exists)
West Allen
West Fen
West Rainton and Leamside
Weston and Crewe Green
Weston By Welland (exists)
Westwood, Worcestershire
Wharram, North Yorkshire (exists)
Whessoe (village)
Whitchurch (parish), Devon
Whiteshill and Ruscombe
Whittington, Northumberland
Whitton and Tosson
Wickham and Knowle
Willingham, Lincolnshire (exists)
Winterton (town) (exists)
Withern with Stain
Wiverton Hall (parish)
Wolsingham Park Moor (same as Wolsingham Park Moor lands cmn to Stanhope, Tow Law and Wolsingham)
Wolsingham Park Moor lands cmn to Stanhope, Tow Law and Wolsingham
Wootton St Lawrence with Ramsdell
Wycliffe with Thorpe
Wymondham and Edmondthorpe (partly exists) (apparently renamed in 2003, simply called Wymondham on OS)
Wyton-on-the-Hill
Yarnfield and Cold Meece
Yeovilton and District
Redirects
Amble By the Sea (same as Amble by the Sea)
Ardley with Fewcott (partly exists) (maybe separate parishes)
Bierton with Broughton (no longer a parish)
Blunsdon St. Andrew (same as Blunsdon St Andrew)
Broadoak, Cornwall (renamed to match village)
Brobury with Monnington on Wye
Castle Bolton with East and West Bolton
Caterham on the Hill (same as Caterham-on-the-Hill)
Chidham (not a parish anymore, now Chidham and Hambrook)
Covenham St. Mary (same as Covenham St Mary)
Creeting St. Peter or West Creeting
Dinnington St John's (same as Dinnington St. John's)
Felmersham and Radwell (partly exists) (Felmersham is a separate parish)
Foston, East Riding of Yorkshire
Hesketh with Becconsall (same as Hesketh-with-Becconsall)
Huntwick with Foulby and Nostell
Ilton cum Pott (same as Ilton-cum-Pott which is on the main list)
Kirkoswald and Renwick (partly exists) (Kirkoswald is a separate parish)
Lillingstone Dayrell with Luffield Abbey
Longwick cum Ilmer (same as Longwick-cum-Ilmer)
Mangotsfield Rural (no longer a parish, at least by this name)
Markingfield Hall (same as Markenfield Hall (parish))
Mawgan in Pydar (same as Mawgan-in-Pydar)
Menwith with Darley (now Darley and Menwith)
Newbottle and Charlton (partly exists) (Newbottle, Northamptonshire is a separate parish)
North Bedlington (!)
North Tidworth (not a parish anymore, see User:Morwen/parish delta)
Nythe (no longer a parish)
Offord Cluny and Offord D'Arcy
Paul (civil parish) (no longer a parish)
Poynton with Worth (same as Poynton-with-Worth)
Richard's Castle (Hereford) (same as Richards Castle (Hereford))
Rushden and Wallington (partly exists) (maybe separate parishes)
Shuckburgh Lower and Upper (same as Upper and Lower Shuckburgh)
Silloth on Solway (same as Silloth-on-Solway)
St Blaise, Cornwall (same as St. Blaise, Cornwall)
St Bridget Beckermet (same as St. Bridget Beckermet)
St. Cosmus and St. Damian in the Blean
St John Beckermet (same as St. John Beckermet)
St Minver Highlands (same as St. Minver Highlands)
St Minver Lowlands (same as St. Minver Lowlands)
St Nicholas Hurst (same as St. Nicholas, Hurst)
St Peter the Great County (same as St. Peter the Great County)
Steeple Gidding (no longer a parish)
Stone with Bishopstone and Hartwell
Widdrington, Northumberland (now Widdrington Village)