Government effectiveness during each prime minister's tenure
Every prime minister since 1991, ranked by how the government effectiveness 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 | +1.6 points 2009 → 2016 | +0.2 points/yr | |
| 2 |  Tony Blair | 2 May 1997 – 27 Jun 2007 | +0.8 points 1996 → 2006 | +0.1 points/yr | |
| 3 | Con Boris Johnson | 24 Jul 2019 – 6 Sep 2022 | −2.3 points 2019 → 2022 | −0.8 points/yr | |
| 4 | Con Theresa May | 13 Jul 2016 – 24 Jul 2019 | −4.5 points 2016 → 2019 | −1.5 points/yr | |
| 5 | Gordon Brown | 27 Jun 2007 – 11 May 2010 | −4.6 points 2006 → 2009 | −1.5 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_GE.SC): perceptions of the quality of public services, the civil service and of policy-making, a score from 0 to 100 with its 90 % interval · United Kingdom data · as of Sep 2026.