Scrutiny is the work Parliament does between elections to hold the government to account. The exam question is rarely whether it happens - it plainly does - but whether it is effective. This walk-through runs each mechanism through the same six tests, then weighs the system as a whole.
Keep one idea in front of you throughout: most scrutiny is strong on exposure and weak on enforcement. Parliament can shine a light on the executive far more than it can force it to change course. Whether that counts as effective accountability is the judgement every 30-mark answer has to reach.
Scrutiny is Parliament's job of examining and holding the executive to account between elections. The effectiveness of any mechanism can be tested the same way each time:
The two chamber mechanisms make the cleanest contrast in the topic - the same House doing theatre and scrutiny in the same week.
The weekly half-hour exchange. The Leader of the Opposition gets six questions; a backbencher gets one with no follow-up; government backbenchers ask planted questions. The PM rarely answers a substantive question and the format rewards the soundbite. PMQs is the most-watched scrutiny event and arguably the least effective - visibility without answers. Pearson's own mark scheme guidance calls it high-profile and dramatic, and stops short of calling it effective.
Granted by the Speaker, not the whips, an urgent question forces a minister to the despatch box the same day on the issue of the moment. Speaker Bercow expanded their use from 2010 and Speaker Hoyle continued it: around 250 were granted in 2010-15 and over 600 in 2019-24. Any MP can apply. It is the sharpest day-to-day accountability tool the Commons has - though it still produces answers, not amendments.
| Committee | Strength | Limit |
|---|---|---|
| Departmental select committees | Elected chairs by secret ballot since the Wright reforms 2010; ministers answer on the record; Windrush (Home Affairs, 2018, led to Rudd's resignation) and the mini-budget hearings (Treasury, Oct 2022, forced Truss to recall Parliament) led the news. | Around two-thirds of significant recommendations are not implemented. |
| The Liaison Committee | All the select committee chairs together; the only committee that questions the PM directly, three times a year, on substantive policy. | Three sessions a year and no enforcement - the PM controls the answers. |
| The Public Accounts Committee | Usually rated the most effective: chaired by an opposition MP by convention, backed by National Audit Office evidence; departments change spending practice under its pressure. | Confined to value-for-money and spending, not policy generally. |
| Public Bill Committees | Scrutinise legislation line by line. | Whipped, reconstituted for every bill, government amendments almost always the only ones to pass, untouched by the Wright reforms - the weakest link. |
| Lords select committees | The deepest expertise in Parliament (former ministers, scientists, judges), the least partisan, real influence on technical questions. | Advice without a mandate, and rarely covered by the media. |
No single party holds a majority, many peers are crossbenchers, and nobody faces re-election - so the chamber is hard to whip and serious about detail. A Lords defeat forces the Commons to think again, and the October 2015 tax credits defeat forced a full government retreat. The limits are constitutional: the Salisbury Convention protects manifesto bills and the Parliament Acts cap delay at about a year.
The scrutiny mechanism inside the governing party. Rebellions have risen in every parliament since 2001, and governments usually negotiate before losing - the threat does most of the work. In spring 2025 the Starmer government dropped the deepest version of its welfare cuts after a rebellion of 50-plus Labour MPs plus Cabinet pressure. Blair's 139-MP Iraq rebellion in 2003 shows the scale rebellions can reach.
PMQs is the most-watched scrutiny of the week and the least effective: planted questions, no answers, theatre built for the clip. The urgent question is the opposite - granted by the Speaker, forcing a minister to the despatch box the same day, expanded from around 250 in 2010-15 to over 600 in 2019-24. Interim judgement: visibility has risen and the sharpest tool is real, but even the urgent question produces answers, not amendments.
Since the Wright reforms of 2010, select committees have elected chairs and question ministers on the record: the Treasury Committee forced Truss to recall Parliament in October 2022, and Home Affairs exposed Windrush in 2018. The Public Accounts Committee, backed by the National Audit Office, even changes spending practice. But around two-thirds of significant recommendations go unimplemented, and Public Bill Committees - where law is actually made - stay whipped and government-dominated. Interim judgement: the strongest sustained scrutiny the Commons does, inside a hard ceiling on enforcement.
The Lords, unwhippable by design, forces the Commons to think again and won a full government retreat on tax credits in 2015. Backbench rebellions are decisive when majorities are small - the 2025 welfare retreat - but three-line whips still pass around 99% of the time. Interim judgement: a real constraint at the margin, not the norm.
Judgement. Parliament scrutinises the executive visibly and often, and does so more intensively than before 2010 where the Wright reforms and the urgent question reached. But the legislation stage and PMQs are untouched, and exposure rarely converts into enforcement. Effective at holding the executive up to the light; limited at forcing it to change.