A GP sends a request for specialist advice on a patient with suspected cancer. She has already decided the case needs a hospital assessment, not a second opinion on whether to make one. The request sits in a digital queue. Days pass, then weeks. When a response finally arrives, it asks for further tests the practice cannot easily arrange, or simply declines to advise. The referral that should have happened at the first appointment happens much later, if it happens through this route at all.

That scenario, or something close to it, sits behind the interim report published this week by the Health Services Safety Investigations Body. Its investigators found that advice and guidance services, introduced to let GPs consult specialists before referring patients to hospital, have in places been used on pathways where a family doctor had already requested assessment for suspected cancer. The consequences included delayed diagnosis, poorer prognosis and, in some cases, avoidable surgery. HSSIB was careful to record where the scheme has worked well, easing pressure on outpatient clinics and sharpening the quality of referrals that do get made. But the harm it documented was specific and serious, and it arrived alongside a survey of more than seven hundred GPs by Pulse in which a quarter reported referrals returned as unsolicited advice and guidance rather than accepted.

What makes this more than an isolated failure of implementation is the direction the scheme has been pushed in over the past year. Advice and guidance began as a discretionary tool, something a GP might use when genuinely uncertain. Under this year's GP contract, practices are now required to use it across specialities before or instead of a referral wherever it is judged clinically appropriate, and from October, referral requests will pass through a consultant-led single point of access for triage. A mechanism designed to add a layer of clinical dialogue has, in a growing number of pathways, become a mandatory gate that a referral must pass through before it counts.

This matters well beyond primary care. The logic behind the mandate is sound on paper: fewer unnecessary hospital appointments, faster access to specialist input, better use of scarce consultant time in a system where waiting lists remain the single measure ministers are judged on. But HSSIB's report describes a scheme rolled out with limited data on patient safety outcomes, inconsistent local rules, and weak incident reporting, expanding faster than the infrastructure needed to monitor it. That is a familiar pattern in NHS reform under financial strain, where a plausible efficiency measure is scaled nationally before anyone has established whether the version being scaled is the version that works.

The timing sharpens the point. Yvette Cooper has inherited a health brief from Wes Streeting in which productivity, not investment, is the watchword ahead of the Chancellor's Budget in October, and integrated care boards, already consolidating and shedding staff, are the bodies meant to be monitoring exactly the kind of local variation HSSIB describes. Fewer people are being asked to oversee more automated gatekeeping, at the moment such gatekeeping is being extended into pathways for suspected cancer, where days genuinely change outcomes. The British Medical Association's response, that this is tragic vindication of concerns GPs raised from the outset, reflects a wider unease that efficiency targets are being met by shifting risk downstream rather than removing it.

HSSIB has recommended a rapid evaluation of advice and guidance services, addressing capacity, training and reporting gaps, and standardised templates so specialties are not each inventing their own rules. NHS England says it has already commissioned a review of impact, due this year. The test now is whether that evaluation is allowed to slow the scheme's expansion where the evidence demands it, or whether the mandate keeps running ahead of the monitoring meant to justify it. A referral system cannot be judged safe simply because it reduces the number of referrals. It has to be judged by what happens to the patients who were never seen.