Control of corruption during each prime minister's tenure
Every prime minister since 1991, ranked by how the control of corruption changed from their first day in office. Politare shows what happened during a tenure; it does not claim the office-holder caused it.
| # | Prime minister | In office | Total | Per year | Chart |
|---|---|---|---|---|---|
| 1 | Con David Cameron | 11 May 2010 – 13 Jul 2016 | +7.9 points 2009 → 2016 | +1.1 points/yr | |
| 2 | Con Theresa May | 13 Jul 2016 – 24 Jul 2019 | +0.3 points 2016 → 2019 | +0.1 points/yr | |
| 3 | Con Boris Johnson | 24 Jul 2019 – 6 Sep 2022 | −2.8 points 2019 → 2022 | −0.9 points/yr | |
| 4 |  Tony Blair | 2 May 1997 – 27 Jun 2007 | −6.4 points 1996 → 2006 | −0.6 points/yr | |
| 5 | Gordon Brown | 27 Jun 2007 – 11 May 2010 | −7.3 points 2006 → 2009 | −2.4 points/yr |
Sorted by total, highest first. Every row is indexed to the last count complete before the first day in office ("from" marks a start that had to move because that count had no data, or because the period cut it); Levels are per cent changes, rates are differences in points; "per year" compounds levels and divides rates. Tenures with under 12 months, or under three observations, are left out. points, 0 to 100, higher is better · World Bank, Worldwide Governance Indicators (GOV_WGI_CC.SC): perceptions of public power used for private gain, petty and grand, a score from 0 to 100 with its 90 % interval · United Kingdom data · as of Sep 2026.