Here is a list of the top target seats for the main political parties at the General Election on July 4.
The election is being held using new constituency boundaries, which means the results cannot be compared directly with what happened at the last general election in 2019.
To measure how well the parties do at the election, and to determine which seats they need to win to form a government, a set of notional results for the 2019 election has been calculated to show what would have happened if that contest had taken place using the new boundaries.
These notional results have been compiled by Professor Colin Rallings and Professor Michael Thrasher of the University of Plymouth, on behalf of the PA news agency, the BBC, ITN and Sky News.
The lists of target seats are based on the size of the swing in the share of the vote needed to gain the seat, calculated using the notional outcome in 2019.
The top 150 targets have been listed for Labour, the top 100 for the Liberal Democrats, the top 50 for the Conservatives and the top 10 for other parties (top nine for the SNP, as they can only make a maximum of nine gains).
The lists are ranked according to the size of the swing to gain, starting with the smallest.
The name of the constituency is followed in brackets by the notional 2019 winner of the seat, then by the size of the swing needed to gain, in percentage points.
Where appropriate, the swing takes account of the need to overtake the second placed party.
– Labour targets
1 Burnley (Con) 0.13 percentage points
2 Leigh & Atherton (Con) 0.33
3 High Peak (Con) 0.54
4 Bangor Aberconwy (Con) 0.77
5 Wolverhampton West (Con) 0.92
6 Bury South (Con) 0.94
7 Bury North (Con) 1.20
8 Bolton North East (Con) 1.28
9 Watford (Con) 1.35
10 Chingford & Woodford Green (Con) 1.47
11 Wycombe (Con) 1.59
12 Birmingham Northfield (Con) 1.69
13 Leeds North West (Con) 1.80
14 Stroud (Con) 2.03
15 Keighley & Ilkley (Con) 2.11
16 Stoke-on-Trent Central (Con) 2.11
17 Whitehaven & Workington (Con) 2.17
18 Lothian East (SNP) 2.17
19 Gedling (Con) 2.22
20 Walsall & Bloxwich (Con) 2.40
21 Peterborough (Con) 2.47
22 Vale of Glamorgan (Con) 2.57
23 West Bromwich (Con) 2.60
24 Cheshire Mid (Con) 2.66
25 Wakefield & Rothwell (Con) 2.67
26 Ynys Mon (Con) 2.69
27 Derby North (Con) 2.70
28 Bridgend (Con) 2.73
29 Clwyd North (Con) 2.76
30 Lancaster & Wyre (Con) 3.05
31 Hastings & Rye (Con) 3.36
32 Eltham & Chislehurst (Con) 3.37
33 Cowdenbeath & Kirkcaldy (SNP) 3.41
34 Lincoln (Con) 3.47
35 Hyndburn (Con) 3.48
36 Broxtowe (Con) 3.58
37 Chipping Barnet (Con) 3.60
38 Northampton North (Con) 3.85
39 Newton Aycliffe & Spennymoor (Con) 3.93
40 Hendon (Con) 4.01
41 Truro & Falmouth (Con) 4.04
42 Wrexham (Con) 4.18
43 Hull West & Haltemprice (Con) 4.35
44 Blackpool South (Con) 4.36
45 Calder Valley (Con) 4.52
46 Milton Keynes Central (Con) 4.70
47 Southampton Itchen (Con) 4.74
48 Clwyd East (Con) 5.00
49 Glasgow North East (SNP) 5.01
50 Darlington (Con) 5.36
51 Redcar (Con) 5.45
52 Ipswich (Con) 5.53
53 Coatbridge & Bellshill (SNP) 5.54
54 Altrincham & Sale West (Con) 5.61
55 Swindon South (Con) 5.70
56 Cities of London & Westminster (Con) 5.73
57 Airdrie & Shotts (SNP) 5.74
58 Bolsover (Con) 5.77
59 Shipley (Con) 5.78
60 Crewe & Nantwich (Con) 5.79
61 Loughborough (Con) 5.90
62 Midlothian (SNP) 5.92
63 Rutherglen (SNP) 5.97
64 Tipton & Wednesbury (Con) 6.14
65 Rushcliffe (Con) 6.18
66 Norwich North (Con) 6.31
67 Spen Valley (Con) 6.42
68 Glasgow South West (SNP) 6.43
69 Milton Keynes North (Con) 6.55
70 Worcester (Con) 6.64
71 Glasgow North (SNP) 6.72
72 Rother Valley (Con) 6.74
73 Southport (Con) 6.80
74 Ashfield (Con) 6.81
75 Shrewsbury (Con) 6.96
76 Worthing East & Shoreham (Con) 7.03
77 Caerfyrddin (Con) 7.04
78 Penistone & Stocksbridge (Con) 7.28
79 Barrow & Furness (Con) 7.43
80 Ceredigion Preseli (Plaid Cymru) 7.49
81 Colne Valley (Con) 7.50
82 Filton & Bradley Stoke (Con) 7.61
83 Glasgow East (SNP) 7.62
84 Uxbridge & South Ruislip (Con) 7.82
85 Pembrokeshire Mid & South (Con) 7.84
86 Thanet East (Con) 7.91
87 Corby & East Northamptonshire (Con) 8.05
88 Leeds South West & Morley (Con) 8.16
89 Hamilton & Clyde Valley (SNP) 8.18
90 Bishop Auckland (Con) 8.19
91 Chelsea & Fulham (Con) 8.21
92 Crawley (Con) 8.38
93 Na h-Eileanan an Iar (SNP) 8.42
94 Harrow East (Con) 8.59
95 South Ribble (Con) 8.65
96 Newcastle-under-Lyme (Con) 8.73
97 Bournemouth East (Con) 8.94
98 Stevenage (Con) 8.98
99 Motherwell, Wishaw & Carluke (SNP) 9.23
100 Glasgow South (SNP) 9.42
101 Camborne & Redruth (Con) 9.55
102 Inverclyde & Renfrewshire West (SNP) 9.64
103 Stoke-on-Trent North (Con) 9.65
104 Gloucester (Con) 9.67
105 Finchley & Golders Green (Con) 9.72
106 York Outer (Con) 9.85
107 Rossendale & Darwen (Con) 9.85
108 Wolverhampton North East (Con) 9.92
109 Macclesfield (Con) 9.94
110 Blackpool North & Fleetwood (Con) 10.11
111 Monmouthshire (Con) 10.25
112 Glasgow West (SNP) 10.29
113 Scarborough & Whitby (Con) 10.33
114 Dunfermline & Dollar (SNP) 10.36
115 Welwyn Hatfield (Con) 10.40
116 Hitchin (Con) 10.42
117 Dunbartonshire West (SNP) 10.56
118 Bolton West (Con) 10.65
119 Scunthorpe (Con) 10.72
120 Erewash (Con) 10.86
121 Bournemouth West (Con) 10.86
122 Carlisle (Con) 11.02
123 Edinburgh North & Leith (SNP) 11.03
124 Earley & Woodley (Con) 11.05
125 Glenrothes & Mid Fife (SNP) 11.06
126 Colchester (Con) 11.14
127 Stockton West (Con) 11.29
128 Edinburgh East & Musselburgh (SNP) 11.29
129 Hexham (Con) 11.29
130 Ossett & Denby Dale (Con) 11.34
131 Middlesbrough South & East Cleveland (Con) 11.44
132 Dwyfor Meirionnydd (Plaid Cymru) 11.45
133 Doncaster East & the Isle of Axholme (Con) 11.70
134 Great Grimsby & Cleethorpes (Con) 11.71
135 Pendle & Clitheroe (Con) 11.92
136 Paisley & Renfrewshire South (SNP) 11.96
137 Basingstoke (Con) 12.02
138 Bathgate & Linlithgow (SNP) 12.11
139 Dover & Deal (Con) 12.13
140 Penrith & Solway (Con) 12.33
141 Cumbernauld & Kirkintilloch (SNP) 12.45
142 Telford (Con) 12.52
143 Paisley & Renfrewshire North (SNP) 12.56
144 Livingston (SNP) 12.61
145 Buckingham & Bletchley (Con) 12.68
146 East Kilbride & Strathaven (SNP) 12.74
147 Morecambe & Lunesdale (Con) 12.75
148 Derbyshire North East (Con) 13.04
149 Rugby (Con) 13.10
150 Croydon South (Con) 13.17
– Liberal Democrat targets
1 Carshalton & Wallington (Con) 0.64 percentage points
2 Fife North East (SNP) 0.70
3 Wimbledon (Con) 0.74
4 Sheffield Hallam (Lab) 0.92
5 Cambridgeshire South (Con) 1.25
6 Cheltenham (Con) 1.25
7 Dunbartonshire Mid (SNP) 1.70
8 Cheadle (Con) 2.09
9 Eastbourne (Con) 2.11
10 Caithness, Sutherland & Easter Ross (SNP) 2.64
11 Esher & Walton (Con) 2.68
12 Guildford (Con) 2.96
13 Lewes (Con) 3.71
14 Hazel Grove (Con) 4.18
15 Westmorland & Lonsdale (Con) 4.74
16 St Ives (Con) 4.85
17 Finchley & Golders Green (Con) 5.98
18 Cities of London & Westminster (Con) 6.05
19 Winchester (Con) 7.08
20 Taunton & Wellington (Con) 7.84
21 Harrogate & Knaresborough (Con) 7.91
22 Cambridge (Lab) 8.14
23 Sutton & Cheam (Con) 8.27
24 Woking (Con) 8.60
25 Brecon, Radnor & Cwm Tawe (Con) 8.70
26 Eastleigh (Con) 8.72
27 Didcot & Wantage (Con) 9.22
28 Bermondsey & Old Southwark (Lab) 9.28
29 Dorking & Horley (Con) 9.52
30 Godalming & Ash (Con) 9.63
31 Dorset West (Con) 10.71
32 Chelsea & Fulham (Con) 10.82
33 Henley & Thame (Con) 11.05
34 Newbury (Con) 11.24
35 Wokingham (Con) 11.59
36 Hitchin (Con) 11.67
37 Hampstead & Highgate (Lab) 11.68
38 St Neots & Mid Cambridgeshire (Con) 12.24
39 Ely & East Cambridgeshire (Con) 12.35
40 Devon South (Con) 12.66
41 Wells & Mendip Hills (Con) 12.66
42 Sussex Mid (Con) 12.90
43 Frome & East Somerset (Con) 12.92
44 Thornbury & Yate (Con) 12.96
45 Chippenham (Con) 13.06
46 Farnham & Bordon (Con) 13.27
47 Devon North (Con) 13.33
48 Glastonbury & Somerton (Con) 13.33
49 Tunbridge Wells (Con) 13.40
50 Earley & Woodley (Con) 13.48
51 Harpenden & Berkhamsted (Con) 13.50
52 Yeovil (Con) 13.52
53 Ceredigion Preseli (PC) 13.63
54 Bicester & Woodstock (Con) 13.66
55 Norfolk North (Con) 14.05
56 Chelmsford (Con) 14.32
57 Cornwall North (Con) 14.59
58 Epsom & Ewell (Con) 14.68
59 Romsey & Southampton North (Con) 14.85
60 Aylesbury (Con) 14.90
61 Surrey Heath (Con) 14.92
62 Durham (Lab) 14.92
63 Dorset Mid & North Poole (Con) 15.09
64 Cotswolds South (Con) 15.13
65 Runnymede & Weybridge (Con) 15.26
66 Melksham & Devizes (Con) 15.27
67 York Outer (Con) 15.48
68 Horsham (Con) 15.54
69 Edinburgh North & Leith (SNP) 15.64
70 Hornsey & Friern Barnet (Lab) 15.81
71 Banbury (Con) 15.81
72 Witney (Con) 16.05
73 Newton Abbot (Con) 16.65
74 Inverness, Skye & West Ross-shire (SNP) 16.78
75 Maidenhead (Con) 16.79
76 Chesham & Amersham (Con) 16.96
77 Brentford & Isleworth (Lab) 17.00
78 Bathgate & Linlithgow (SNP) 17.39
79 Torbay (Con) 17.41
80 Ealing Central & Acton (Lab) 17.47
81 East Grinstead & Uckfield (Con) 17.73
82 Newcastle upon Tyne North (Lab) 17.75
83 Stratford-on-Avon (Con) 17.76
84 Clapham & Brixton Hill (Lab) 17.78
85 Salisbury (Con) 17.87
86 Dunfermline & Dollar (SNP) 17.93
87 Reigate (Con) 17.97
88 Tewkesbury (Con) 18.05
89 Kensington & Bayswater (Lab) 18.16
90 Montgomeryshire & Glyndwr (Con) 18.43
91 Hammersmith & Chiswick (Lab) 18.45
92 Somerset North (Con) 18.45
93 Windsor (Con) 18.58
94 Hampshire East (Con) 18.64
95 Islington South & Finsbury (Lab) 18.66
96 Harborough, Oadby & Wigston (Con) 18.76
97 Buckingham & Bletchley (Con) 18.81
98 Colchester (Con) 18.83
99 Morecambe & Lunesdale (Con) 19.00
100 Edinburgh South (Lab) 19.01
– Conservative targets
1 Warrington South (Lab) 0.06 percentage points
2 Coventry North West (Lab) 0.22
3 Kensington & Bayswater (Lab) 0.36
4 Alyn & Deeside (Lab) 0.39
5 Wirral West (Lab) 0.41
6 Beckenham & Penge (Lab) 0.52
7 Heywood & Middleton North (Lab) 0.80
8 Dagenham & Rainham (Lab) 0.80
9 Coventry South (Lab) 0.86
10 Warwick & Leamington (Lab) 1.12
11 Bedford (Lab) 1.19
12 Pontefract, Castleford & Knottingley (Lab) 1.31
13 Doncaster Central (Lab) 1.38
14 Ceredigion Preseli (Plaid Cymru) 1.40
15 Rawmarsh & Conisbrough (Lab) 1.55
16 Chesterfield (Lab) 1.61
17 Oldham East & Saddleworth (Lab) 1.62
18 Warrington North (Lab) 1.63
19 Canterbury (Lab) 1.89
20 Halifax (Lab) 1.99
21 Newport West & Islwyn (Lab) 2.06
22 Perth & Kinross-shire (SNP) 2.09
23 Cramlington & Killingworth (Lab) 2.24
24 Ayr, Carrick & Cumnock (SNP) 2.50
25 Moray West, Nairn & Strathspey (SNP) 2.58
26 Doncaster North (Lab) 2.58
27 Nottingham North & Kimberley (Lab) 2.89
28 Gower (Lab) 2.93
29 Leeds East (Lab) 3.06
30 Leeds West & Pudsey (Lab) 3.09
31 Wolverhampton South East (Lab) 3.10
32 Tynemouth (Lab) 3.26
33 Bradford South (Lab) 3.34
34 Croydon East (Lab) 3.37
35 Sunderland Central (Lab) 3.41
36 Stalybridge & Hyde (Lab) 3.48
37 Lothian East (SNP) 3.66
38 Hull East (Lab) 3.67
39 Houghton & Sunderland South (Lab) 3.73
40 Rotherham (Lab) 3.79
41 Putney (Lab) 3.98
42 Birmingham Erdington (Lab) 3.98
43 Worsley & Eccles (Lab) 4.00
44 Normanton & Hemsworth (Lab) 4.06
45 Llanelli (Lab) 4.32
46 Hartlepool (Lab) 4.38
47 Durham, City of (Lab) 4.54
48 Blaydon & Consett (Lab) 4.56
49 Stockton North (Lab) 4.61
50 Durham North (Lab) 4.63
– Green targets
1 Bristol Central (Lab) 16.23 percentage points
2 Isle of Wight West (Con) 19.30
3 Edinburgh North & Leith (SNP) 20.26
4 Dunfermline & Dollar (SNP) 21.35
5 Frome & East Somerset (Con) 21.61
6 Isle of Wight East (Con) 21.70
7 Hampstead & Highgate (Lab) 21.99
8 Livingston (SNP) 22.34
9 Bathgate & Linlithgow (SNP) 22.46
10 East Kilbride & Strathaven (SNP) 22.48
– SNP targets
1 Aberdeenshire West & Kincardine (Con) 0.79 percentage points
2 Dumfries & Galloway (Con) 1.48
3 Aberdeenshire North & Moray East (Con) 2.61
4 Edinburgh West (Lib Dems) 2.62
5 Gordon & Buchan (Con) 3.39
6 Dumfriesshire, Clydesdale & Tweeddale (Con) 4.26
7 Berwickshire, Roxburgh & Selkirk (Con) 4.84
8 Orkney & Shetland (Lib Dems) 5.41
9 Edinburgh South (Lab) 10.18
– Plaid Cymru targets
1 Ynys Mon (Con) 3.48 percentage points
2 Caerfyrddin (Con) 4.25
3 Llanelli (Lab) 9.53
4 Caerphilly (Lab) 14.59
5 Pontypridd (Lab) 17.87
6 Neath & Swansea East (Lab) 19.70
7 Cardiff West (Lab) 21.34
8 Merthyr Tydfil & Aberdare (Lab) 21.78
9 Rhondda & Ogmore (Lab) 21.93
10 Aberafan Maesteg (Lab) 21.97
– Reform UK targets
(Based on the notional 2019 performance of the Brexit Party, as Reform UK was then called)
1 Barnsley North (Lab) 4.50 percentage points
2 Hartlepool (Lab) 5.92
3 Barnsley South (Lab) 6.29
4 Doncaster North (Lab) 12.82
5 Easington (Lab) 14.31
6 South Shields (Lab) 14.70
7 Rotherham (Lab) 16.07
8 Normanton & Hemsworth (Lab) 16.19
9 Blaenau Gwent & Rhymney (Lab) 16.20
10 Caerphilly (Lab) 16.85