How is the inspector exam different from the sergeant exam?

Both are NPPF Step 2 multiple-choice legal knowledge exams set by the College of Policing, with similar format and length. The inspector exam covers a wider syllabus — including more advanced procedure, evidential issues, complex offences, and the supervisory/command perspectives expected at inspector level. Difficulty is set higher than the sergeant exam.

Can I sit the inspector exam without having been a sergeant?

No. NPPF Step 2 (inspector) requires the candidate to be a substantive sergeant. There is no fast-track from constable to inspector via the NPPF route — the SIPP pilot and some direct entry inspector schemes operate separately and have their own eligibility criteria.

When are the sittings held?

Twice a year, typically in spring and autumn, alongside the sergeant exam. Exact dates are published annually by the College of Policing.

How long should I study for?

Most successful inspector candidates study 16–28 weeks at 10–14 hours per week — somewhat longer and deeper than for the sergeant exam. The wider syllabus and higher pass standard require more time, particularly for officers who have moved away from frontline statutory work into specialism.

What materials should I use?

Blackstone's Police Manuals (full four-volume set) remain the canonical text. The Blackstone's Question Bank covers both sergeant and inspector levels. Many candidates also use Police-Pass or Police Inspire study courses for the inspector level. The College of Policing publishes the syllabus.

Police Inspector Exam (NPPF Step 2)

The legal knowledge exam every substantive sergeant must pass to be eligible for inspector promotion.

Unofficial independent resource — always verify with official sources (College of Policing, your force, PFEW).

Reviewed by the BlueLineHub Editorial Team

Last reviewed: 29 May 2026 · Next review due: 29 November 2026

What it is

The NPPF Step 2 (inspector) legal knowledge exam is the multiple-choice exam every substantive sergeant must pass to be eligible for substantive promotion to inspector under the National Police Promotion Framework. It tests the wider legal and procedural knowledge expected of a supervisor managing sergeants and complex multi-team operations.

How it differs from the sergeant exam

Wider syllabus — covers everything in the sergeant exam plus more advanced evidential, procedural, supervisory and command areas.
Higher pass standard — set by the College of Policing per sitting; tends to be slightly higher than the sergeant exam.
More complex application — more questions involve applying principles to scenarios rather than recalling pure law.
Requires substantive sergeant rank — you cannot sit it as a constable.

Format and length

Format: multiple choice, computer-based, sat at a designated test centre.
Length: approximately 150 questions across approximately 3 hours.
Pass mark: set by the College of Policing per sitting; not a fixed percentage.
Sittings: twice yearly, alongside the sergeant exam.
Result release: typically 4–6 weeks after the sitting.

Study planning

Allow 16–28 weeks at 10–14 hours per week. A practical pattern:

Weeks 1–6: full read of each Blackstone's volume; build flashcards on weak areas.
Weeks 7–14: question-bank practice + targeted re-reading of weak chapters.
Weeks 15–22: timed mock papers; focus on weakest topics; consolidate procedural knowledge.
Final 2–4 weeks: light maintenance revision, full mocks under exam conditions.

Use our NPPF Study Planner to model a realistic schedule.

After Step 2 — Step 3 and board

Passing Step 2 gives you eligibility but is not promotion. To become a substantive inspector you must also complete Step 3 (work-based assessment) and a force-led promotion board, both grounded in the CVF at Level 2 behaviours.

Official inspector-exam sources

BlueLineHub is independent and unofficial. Always verify with the authoritative source below.

College of Policing — NPPF Step 2 (inspector)
Authoritative source for exam regulations and syllabus.
Last checked: May 2026
Verify on official source
Blackstone's Police Manuals
Canonical study text covering all four volumes.
Last checked: May 2026
Verify on official source
PFEW — Promotion guidance
Federation member-facing promotion resources.
Last checked: May 2026
Verify on official source

Frequently asked

How is the inspector exam different from the sergeant exam?: Both are NPPF Step 2 multiple-choice legal knowledge exams set by the College of Policing, with similar format and length. The inspector exam covers a wider syllabus — including more advanced procedure, evidential issues, complex offences, and the supervisory/command perspectives expected at inspector level. Difficulty is set higher than the sergeant exam.
Can I sit the inspector exam without having been a sergeant?: No. NPPF Step 2 (inspector) requires the candidate to be a substantive sergeant. There is no fast-track from constable to inspector via the NPPF route — the SIPP pilot and some direct entry inspector schemes operate separately and have their own eligibility criteria.
When are the sittings held?: Twice a year, typically in spring and autumn, alongside the sergeant exam. Exact dates are published annually by the College of Policing.
How long should I study for?: Most successful inspector candidates study 16–28 weeks at 10–14 hours per week — somewhat longer and deeper than for the sergeant exam. The wider syllabus and higher pass standard require more time, particularly for officers who have moved away from frontline statutory work into specialism.
What materials should I use?: Blackstone's Police Manuals (full four-volume set) remain the canonical text. The Blackstone's Question Bank covers both sergeant and inspector levels. Many candidates also use Police-Pass or Police Inspire study courses for the inspector level. The College of Policing publishes the syllabus.