| Territorial constituency for the London Assembly | |
 South West shown within London | |
| Created | 2000 |
|---|---|
| Number of members | One |
| Member | Gareth Roberts |
| Party | Liberal Democrat |
| Last election | 2024 |
| Next election | 2028 |
South West is a constituency represented in the London Assembly. It is represented by Gareth Roberts of the Liberal Democrats.
It covers the combined area of the London Borough of Hounslow, the Royal Borough of Kingston upon Thames, and the London Borough of Richmond upon Thames.
| Election | Member | Party | |
|---|---|---|---|
| 2000 | Tony Arbour | Conservative | |
| 2021 | Nick Rogers | Conservative | |
| 2024 | Gareth Roberts | Liberal Democrats | |
Below are the results for the candidate which received the highest share of the popular vote in the constituency at each mayoral election.
| Party | Candidate | Constituency | List | |||||
|---|---|---|---|---|---|---|---|---|
| Votes | % | ±% | Votes | % | ±% | |||
| Liberal Democrats | Gareth Roberts | 66,675 | 32.6 |  4.4 | 47,461 | 23.2 | ||
| Labour | Marcela Benedetti | 50,656 | 24.8 |  1.5 | 54,108 | 26.4 | ||
| Conservative | Ron Mushiso | 49,981 | 24.4 | 7.5 | 53,042 | 25.9 | ||
| Green | Chas Warlow | 17,696 | 8.6 | 2.1 | 19,980 | 9.8 | ||
| Reform UK | Steve Chilcott | 14,450 | 7.1 | 5.5 | 11,950 | 5.8 | ||
| Independent | Abigail Dawn Hardy | 5,205 | 2.5 | New | ||||
| Rejoin EU | 5,165 | 2.5 | ||||||
| Animal Welfare | 3,618 | 1.8 | ||||||
| Britain First | 2,525 | 1.2 | ||||||
| CPA | 1,969 | 1.0 | ||||||
| SDP | 1,869 | 0.9 | ||||||
| Independent | Laurence Fox | 1,220 | 0.6 | |||||
| Independent | Farah London | 731 | 0.4 | |||||
| Communist | 672 | 0.3 | ||||||
| Heritage | 389 | 0.2 | ||||||
| Independent | Gabe Romualdo | 127 | 0.1 | |||||
| Majority | 16,019 | 7.8 | ||||||
| Valid Votes | 204,663 | 204,826 | ||||||
| Invalid Votes | 1,281 | 1,127 | ||||||
| Turnout | 205,944 | 45.2 | 2.6 | 205,953 | 45.2 | |||
| Liberal Democrats gain from Conservative | Swing | 6.0 | ||||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Nicholas Rogers | 69,212 | 31.9 | -7.6 | |
| Liberal Democrats | Gareth Roberts | 61,222 | 28.2 | +13.9 | |
| Labour Co-op | Candice Atterton | 56,945 | 26.3 | -3.1 | |
| Green | Andree Frieze | 23,135 | 10.7 | +1.5 | |
| Reform UK | Dominique Day | 3,396 | 1.6 | New | |
| Let London Live | Sylvia da Barca | 2,836 | 1.3 | New | |
| Majority | 7,990 | 3.7 | -6.4 | ||
| Total formal votes | 216,746 | ||||
| Informal votes | 2,840 | ||||
| Turnout | 219,586 | 47.8 | |||
| Conservative hold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Tony Arbour | 84,381 | 39.5 | -0.3 | |
| Labour | Martin Whelton | 62,937 | 29.4 | +0.7 | |
| Liberal Democrats | Rosina Robson | 30,654 | 14.3 | -2.4 | |
| Green | Andree Frieze | 19,745 | 9.2 | -0.6 | |
| UKIP | Alan Craig | 14,983 | 7.0 | +2.1 | |
| Socialist (GB) | Adam Buick | 1,065 | 0.5 | New | |
| Majority | 21,444 | 10.1 | -1.0 | ||
| Total formal votes | |||||
| Informal votes | |||||
| Turnout | 213,765 | ||||
| Conservative hold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Tony Arbour | 69,151 | 39.8 | -1.0 | |
| Labour | Lisa Homan | 49,889 | 28.7 | +12.7 | |
| Liberal Democrats | Munira Wilson | 28,947 | 16.7 | -9.8 | |
| Green | Daniel Goldsmith | 17,070 | 9.8 | +3.0 | |
| UKIP | Jeffrey Bolter | 8,505 | 4.9 | +2.9 | |
| Majority | 19,262 | 11.1 | -3.2 | ||
| Total formal votes | 173,562 | 98.6 | |||
| Rejected ballots | 2,518 | 1.4 | |||
| Turnout | 176,080 | 40.2 | -5.2 | ||
| Conservative hold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Tony Arbour | 76,913 | 40.8 | +7.8 | |
| Liberal Democrats | Stephen Knight | 49,985 | 26.5 | –3.8 | |
| Labour | Ansuya Sodha | 30,190 | 16.0 | –1.0 | |
| Green | John Hunt | 12,774 | 6.8 | +0.1 | |
| National Front | Andrew Cripps | 4,754 | 2.5 | New | |
| UKIP | Peter Dul | 3,779 | 2.0 | –6.4 | |
| Christian (CPA) | Sue May | 3,718 | 1.9 | –0.1 | |
| Free England Party | Andrew Constantine | 2,908 | 1.5 | New | |
| English Democrat | Roger Cooper | 1,874 | 1.0 | New | |
| Left List | Tansy Hoskins | 1,526 | 0.8 | New | |
| Majority | 26,928 | 14.3 | +11.6 | ||
| Turnout | 188,421 | 45.4 | +6.9 | ||
| Conservative hold | Swing | +5.8 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Tony Arbour | 48,858 | 33.0 | –2.4 | |
| Liberal Democrats | Dee Doocey | 44,791 | 30.3 | +0.1 | |
| Labour | Seema Malhotra | 25,225 | 17.0 | –5.8 | |
| UKIP | A. G. Hindle | 12,477 | 8.4 | New | |
| Green | Judy Maciejowska | 9,866 | 6.7 | –3.1 | |
| Respect | O. M. Waraich | 3,785 | 2.6 | New | |
| CPA | P. J. Flower | 3,008 | 2.0 | New | |
| Majority | 4,067 | 2.7 | –2.5 | ||
| Turnout | 148,010 | 38.5 | +3.1 | ||
| Conservative hold | Swing | –1.2 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Tony Arbour | 48,248 | 35.4 | N/A | |
| Liberal Democrats | Geoff Pope | 41,189 | 30.2 | N/A | |
| Labour | Jagdish Sharma | 31,065 | 22.8 | N/A | |
| Green | Judy Maciejowska | 13,426 | 9.8 | N/A | |
| London Socialist | Danny Faith | 2,319 | 1.7 | N/A | |
| Majority | 7,059 | 5.2 | N/A | ||
| Turnout | 136,247 | 35.4 | N/A | ||
| Conservative win (new seat) | |||||
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