Roger Williams Elections won
Parliament Member page for Roger Williams
Elections listed as contested and won are those forming part of the general elections in 2010, 2015, 2017, 2019 or 2024 and any by-election contested during the 57th and 58th Parliaments. A person may have contested and won an election outside this grouping.
| Election | Constituency | Election type | Party | Vote count | Vote share | Majority |
| 6 May 2010 | Brecon and Radnorshire | General election | LD | 17,929 | 46.2% | 3,747 |