A teenager signed off work with anxiety two years ago is unlikely to have seen anyone in the health service since. Under the current rules, once a claim is accepted, checks can lapse for a decade. That gap between the label attached to a young person's file and the clinical reality behind it is the quiet flaw sitting underneath Andy Burnham's plan to tie youth sickness benefits to training and voluntary work.

The scheme, modelled on Dutch reforms, is designed to answer a genuine problem. More than 430,000 people aged sixteen to twenty-four are now claiming sickness benefits, and officials trace much of that rise to reported anxiety, autism and ADHD. Milburn's review found that 84 per cent of young people receiving the health element of Universal Credit face no work-readying requirement at all. Politically, tightening that arrangement is close to costless. Reform depends less on parliamentary arithmetic than on an assumption ministers have not tested: that the health service can tell them, promptly and reliably, who genuinely cannot work and who can.

It cannot, not at the pace this policy needs. England's mental health waiting list runs to around 1.7 million people, with roughly 735,000 open referrals for ADHD assessment alone. Neurodevelopmental assessments for autism and ADHD already carry some of the longest waits anywhere in the NHS, often measured in years. If Burnham wants claimants regularly reassessed, or wants clinicians to certify whether a young person's condition permits training rather than simply signing a form once and moving on, he is asking an already rationed part of the NHS to take on a volume of statutory work it was never built to carry.

This is not a hypothetical concern invented for the sake of argument. The Timms review into personal independence payments has already identified NHS capacity, alongside social care and housing pressures, as one of the wider system strains feeding the growth in disability claims it is trying to control. PIP is on course to become the single gateway for health-related benefits once the work capability assessment is abolished, which means the credibility of the entire welfare settlement will rest even more heavily on assessments the NHS is not resourced to deliver at scale or speed.

There is a second complication buried in Burnham's own language. He has spoken of mental health support being "provided in work" for claimants who take up training or voluntary placements, gesturing toward something closer to occupational health provision than mainstream NHS mental health care. That distinction matters enormously to who commissions it, who pays for it and how it interacts with a CAMHS and adult mental health system already operating past capacity. Building a parallel layer of workplace-adjacent mental health support outside NHS commissioning might ease pressure on clinical waiting lists, but it would also mean the state deciding who counts as too unwell to work using judgements made partly outside the health service altogether, an arrangement that raises its own questions about consistency and appeal.

None of this makes conditionality the wrong policy. Milburn is right that indefinite, unconditional sickness payments serve nobody well, least of all the young people they leave stranded. But a policy that depends on clinical judgement to function fairly cannot be designed as though that judgement is freely available. Every recent NHS mental health strategy document has acknowledged the backlog without setting a timeline to clear it, and DWP has been drawing lessons from the Netherlands without yet explaining how Britain's differently resourced mental health system will support the enforcement mechanism it wants to build.

Burnham inherits a Prime Minister's job that already requires him to find money for defence and social care from the same welfare budget he now wants to reform. The temptation will be to legislate the conditionality first and leave the assessment infrastructure to catch up later, the way governments usually do. If he does, this reform will not fail because it lacked political courage. It will fail because it asked an overstretched health service to make a judgement call it did not have the capacity to make in time.