Notional results for a UK general election on 5 May 2005 London, England - by majority
| Constituency | Winning party | Valid votes | Majority (votes) | Majority (%) |
| Camberwell and Peckham | Lab | 38,773 | 16,608 | 42.8% |
| Tottenham | Lab | 31,664 | 13,034 | 41.2% |
| Beckenham | Con | 41,864 | 16,913 | 40.4% |
| Ealing, Southall | Lab | 34,283 | 13,140 | 38.3% |
| Lewisham, Deptford | Lab | 34,760 | 13,012 | 37.4% |
| East Ham | Lab | 41,266 | 13,649 | 33.1% |
| Barking | Lab | 36,871 | 12,183 | 33.0% |
| Greenwich and Woolwich | Lab | 35,517 | 11,638 | 32.8% |
| Mitcham and Morden | Lab | 39,716 | 12,739 | 32.1% |
| West Ham | Lab | 38,644 | 12,274 | 31.8% |
| Hackney South and Shoreditch | Lab | 30,697 | 9,629 | 31.4% |
| Croydon North | Lab | 45,225 | 14,185 | 31.4% |
| Ruislip, Northwood and Pinner | Con | 43,218 | 13,274 | 30.7% |
| Chelsea and Fulham | Con | 34,415 | 10,253 | 29.8% |
| Hayes and Harlington | Lab | 36,939 | 10,594 | 28.7% |
| Romford | Con | 42,389 | 12,120 | 28.6% |
| Edmonton | Lab | 36,406 | 10,312 | 28.3% |
| Croydon South | Con | 50,914 | 14,228 | 27.9% |
| Chingford and Woodford Green | Con | 38,648 | 10,641 | 27.5% |
| Erith and Thamesmead | Lab | 37,805 | 9,870 | 26.1% |
| Hackney North and Stoke Newington | Lab | 30,920 | 8,002 | 25.9% |
| Vauxhall | Lab | 34,644 | 8,503 | 24.5% |
| Lewisham East | Lab | 37,578 | 8,758 | 23.3% |
| Walthamstow | Lab | 34,444 | 7,993 | 23.2% |
| Cities of London and Westminster | Con | 32,019 | 7,352 | 23.0% |
| Old Bexley and Sidcup | Con | 42,306 | 9,309 | 22.0% |
| Ilford South | Lab | 42,693 | 9,228 | 21.6% |
| Islington North | Lab | 31,494 | 6,716 | 21.3% |
| Leyton and Wanstead | Lab | 34,355 | 7,253 | 21.1% |
| Bromley and Chislehurst | Con | 40,045 | 8,236 | 20.6% |
| Brent North | Lab | 44,054 | 8,830 | 20.0% |
| Dulwich and West Norwood | Lab | 39,756 | 7,853 | 19.8% |
| Twickenham | LD | 51,687 | 9,965 | 19.3% |
| Feltham and Heston | Lab | 39,460 | 7,598 | 19.3% |
| Lewisham West and Penge | Lab | 40,628 | 7,779 | 19.1% |
| Brent Central | Lab | 39,267 | 7,469 | 19.0% |
| Holborn and St Pancras | Lab | 44,050 | 8,348 | 19.0% |
| Ealing North | Lab | 43,659 | 8,126 | 18.6% |
| Harrow West | Lab | 42,406 | 7,742 | 18.3% |
| Kingston and Surbiton | LD | 50,173 | 9,084 | 18.1% |
| Uxbridge and South Ruislip | Con | 39,858 | 7,178 | 18.0% |
| Streatham | Lab | 37,692 | 6,584 | 17.5% |
| Hornchurch and Upminster | Con | 49,208 | 8,058 | 16.4% |
| Bermondsey and Old Southwark | LD | 36,052 | 5,769 | 16.0% |
| Dagenham and Rainham | Lab | 40,606 | 6,372 | 15.7% |
| Kensington | Con | 32,131 | 4,540 | 14.1% |
| Bexleyheath and Crayford | Con | 41,900 | 5,167 | 12.3% |
| Tooting | Lab | 42,457 | 5,169 | 12.2% |
| Chipping Barnet | Con | 45,408 | 5,457 | 12.0% |
| Poplar and Limehouse | Lab | 35,276 | 3,823 | 10.8% |
| Orpington | Con | 48,403 | 5,221 | 10.8% |
| Hammersmith | Lab | 43,541 | 3,673 | 8.4% |
| Brentford and Isleworth | Lab | 43,839 | 3,633 | 8.3% |
| Hendon | Lab | 40,087 | 3,231 | 8.1% |
| Eltham | Lab | 38,195 | 2,904 | 7.6% |
| Richmond Park | LD | 50,951 | 3,613 | 7.1% |
| Harrow East | Lab | 42,598 | 2,934 | 6.9% |
| Westminster North | Lab | 32,156 | 2,120 | 6.6% |
| Sutton and Cheam | LD | 43,225 | 2,689 | 6.2% |
| Wimbledon | Con | 43,556 | 2,480 | 5.7% |
| Hornsey and Wood Green | LD | 47,330 | 2,395 | 5.1% |
| Putney | Con | 35,876 | 1,723 | 4.8% |
| Ilford North | Con | 41,917 | 1,735 | 4.1% |
| Carshalton and Wallington | LD | 41,768 | 1,225 | 2.9% |
| Enfield, Southgate | Con | 41,433 | 1,127 | 2.7% |
| Enfield North | Con | 39,823 | 937 | 2.4% |
| Ealing Central and Acton | Lab | 38,801 | 839 | 2.2% |
| Bethnal Green and Bow | Res | 38,366 | 804 | 2.1% |
| Islington South and Finsbury | Lab | 30,961 | 484 | 1.6% |
| Hampstead and Kilburn | Lab | 41,675 | 474 | 1.1% |
| Battersea | Lab | 40,858 | 332 | 0.8% |
| Croydon Central | Lab | 45,592 | 328 | 0.7% |
| Finchley and Golders Green | Con | 41,939 | 294 | 0.7% |
Estimates of the 2005 general election result in new constituencies
Colin Rallings and Michael Thrasher, then at the University of Plymouth, produced estimates of the 2005 general election result as if the new constituencies recommended by the separate Parliamentary Boundary Commissions for England, Wales and Northern Ireland had then been in existence.
The Elections Centre, established by Professors Colin Rallings and Michael Thrasher, moved to the University of Exeter in 2003.