How the NHS is actually structured

Interviewers rarely ask you to recite an org chart. They ask something that only makes sense if you have one: why a GP referral exists, why a drug approved by the regulator still might not be available, why a hospital and a council argue about a discharge. Candidates who have never mapped the system answer those from instinct, and instinct produces confident nonsense.

What follows is the minimum structure to hold. It is dull to learn and it quietly powers everything else — the workforce dispute, the funding of a new drug, every access story in the news.

The NHS launched on 5 July 1948 on three principles that still appear almost verbatim in the NHS Constitution: that it meet the needs of everyone, that it be free at the point of delivery, and that it be based on clinical need rather than ability to pay. Charges exist at the edges — prescriptions in England, most adult dentistry, most optometry — but the principle holds for the core service.

Funding comes from general taxation. That single fact does a lot of work in an interview. It means NHS spending competes with schools, defence and everything else in a Spending Review; it means there is no individual entitlement built from what you have contributed; and it means rationing is not a scandal but an arithmetic certainty. A service funded from a finite pot has to choose. The interesting question is never whether it rations, but how, and how transparently.

Primary care is first contact: general practice, community pharmacy, NHS dentistry, optometry. Most NHS activity happens here, and general practice acts as the gatekeeper to everything beyond it. That gatekeeping is not bureaucracy for its own sake — it concentrates specialist capacity on the people who need it, and it gives one clinician an overview of a patient nobody else has.

Secondary care is what a referral buys: hospital outpatients, inpatient care, most surgery, and emergency departments, which patients reach without a referral. Tertiary care is the highly specialised layer — transplant centres, major trauma, specialist paediatric services — usually concentrated in a few centres because volume is what makes them good.

Providers are mostly organised as NHS trusts and foundation trusts. Both provide care; foundation trusts have somewhat greater financial and governance autonomy and a membership council. General practices, by contrast, are mostly independent businesses holding NHS contracts rather than NHS-employed units — a structural quirk that explains a great deal about how general practice behaves under pressure.

Since the Health and Care Act 2022, England is organised into Integrated Care Systems. Each has an Integrated Care Board — the statutory NHS body holding the budget and commissioning most services for its area — and an Integrated Care Partnership, a broader committee bringing in local authorities, public health and voluntary sector partners to agree a wider strategy. The reform replaced clinical commissioning groups, and the intent was to swap competition for collaboration across a place.

Then the bodies candidates habitually mix up. NICE appraises whether a treatment is clinically and cost effective, using the quality-adjusted life year to compare very different interventions on one scale. The MHRA decides whether a medicine is safe and effective enough to be licensed at all — a different question, asked first. The CQC inspects and rates providers on safety and quality. The GMC and GDC register and regulate individual doctors and dental professionals. And the whole service sits under the Department of Health and Social Care.

Structure questions arrive in three shapes. The direct one: "How is the NHS funded?" or "What is an Integrated Care Board?" The applied one: "A patient cannot get a GP appointment and goes to A&E. What is going on?" And the disguised one, where structure is never mentioned but every good answer needs it — "What is the biggest challenge facing the NHS?"

For the direct question, define, date and then add the why. For the applied question, walk the pathway out loud. For the disguised one, pick one challenge and trace it through the system rather than listing five.

Read the reading path piece on NHS structure next — it goes deeper on the four nations and the commissioning layer. Then pick one live story and trace it back through the structure: the workforce dispute for how pay and staffing are decided, or the once-weekly insulin decision for how a treatment reaches a patient.

Of the primary sources below, the NHS Constitution is the one genuinely worth twenty minutes: it is short, it is the document the principles actually come from, and quoting it accurately is more impressive than quoting a statistic.