When pressure in the NHS intensifies, the instinctive response is often to buy more capacity. Additional clinics are commissioned. Extra sessions are funded. Temporary solutions are deployed to stabilise performance and protect access. 

At moments of acute strain, this response is understandable and sometimes necessary. But the experience of the past winter has made a harder truth increasingly clear: buying capacity is not the same as improving productivity, and confusing the two carries real risk. 

Demand across the NHS remains structurally high, driven by demographic change, unmet need, and sustained pressure across urgent, elective and community services. In many settings, additional capacity is not discretionary, it is required to maintain access and prevent harm. The challenge is not whether capacity should be purchased, but whether the system into which it is introduced can convert that capacity into sustained benefit. 

 

Capacity as the default response to pressure

For much of the recovery period, additional capacity has played a central role in maintaining service delivery. Faced with unprecedented waiting lists, workforce shortages, and rising demand, the NHS has relied on supplementary activity to keep pace. 

This approach has delivered visible gains in some areas, particularly in elective care. But it has also masked deeper inefficiencies and delayed more difficult conversations about system design. 

Capacity can absorb pressure in the short term. Productivity determines whether the system becomes more resilient in the long term. 

 

What winter has exposed about capacity-led solutions

Winter acts as a stress test for the assumptions underpinning recovery strategies. 

As urgent and emergency care pressure intensified, systems that relied heavily on additional capacity found it increasingly difficult to sustain gains. Extra activity was crowded out by flow failure. Beds were repurposed. Staff were redeployed. Planned work was cancelled or delayed. 

In this context, the limits of capacity-led improvement became clear. Where underlying pathways were fragile, additional activity did not translate into sustained benefit. It simply increased exposure to disruption. 

Even where demand is unavoidable, and extra capacity is necessary, its impact is determined by pathway effectiveness. Poor flow does not just reduce productivity, it actively wastes capacity by preventing it from delivering its full value. 

Productivity, by contrast, is revealed in how well a system holds under pressure, not how much activity it can generate in calmer periods. 

 

The difference between more work and better use of resource

At its simplest, productivity is about converting effort into outcome. 

In healthcare, that conversion is shaped less by volume and more by flow: how patients move through pathways, how delays are managed, and how clinical time is protected. 

Buying capacity increases the amount of work a system can attempt. Improving productivity increases the proportion of work that results in timely, effective care. 

The distinction matters. Systems that focus primarily on volume risk chasing activity without resolving the bottlenecks that undermine delivery. Systems that focus on productivity target the points where capacity is lost altogether. 

 

Why flow determines whether capacity pays off

The past winter reinforced a familiar pattern. 

Where discharge was delayed, bed availability constrained, and community capacity insufficient, additional activity had diminishing returns. Clinics could be funded, but patients could not always progress. Staff could be rostered, but continuity was disrupted. Gains achieved in one part of the pathway were undone elsewhere. 

In these circumstances, capacity spending risks becoming inefficient, not because the activity lacks value, but because the system cannot support it end to end. 

Productivity improvement, in contrast, begins by asking where effort is being wasted: in avoidable delay, duplication, poor sequencing, or inadequate handover. 

 

Workforce effort is not an infinite input

A further risk of capacity-led strategies is their reliance on workforce elasticity. 

Additional sessions, extended hours, and temporary measures depend on staff willingness and availability. Over time, this reliance contributes to fatigue, sickness absence, and attrition, undermining the very capacity being purchased. 

The winter experience has shown that workforce resilience cannot be treated as a renewable resource. Productivity strategies that depend on sustained discretionary effort are inherently fragile. 

Improving productivity means reducing the need for heroic effort, not institutionalising it. 

 

Why productivity is harder — and more important

Productivity improvement is more challenging than buying capacity because it requires confronting entrenched issues. 

It demands: 

• redesigning pathways rather than adding sessions, 

• aligning incentives across organisations, 

• addressing discharge and community capacity, 

• and making trade-offs about what activity genuinely adds value. 

These are difficult conversations, particularly in a system under pressure. But they are also unavoidable if recovery is to be sustained. 

The Board papers reflect this shift implicitly, through their emphasis on productivity expectations and delivery confidence. Capacity can no longer be treated as a substitute for system effectiveness. 

 

Capacity has a role — but not the one it is often given

None of this suggests that buying capacity has no place. In periods of extreme pressure, additional activity can prevent harm and stabilise services. 

The problem arises when capacity becomes the primary strategy rather than a targeted intervention. Without parallel productivity improvement, its impact diminishes over time. 

Used well, capacity supports productivity. Used alone, it delays it. 

 

A choice the system must now make

The NHS faces a choice as it moves beyond immediate winter pressures. 

It can continue to rely on capacity expansion to manage demand, accepting that gains will be fragile and uneven. Or it can invest in productivity improvement that strengthens flow, reduces waste, and makes better use of finite resources. 

The first option is quicker. The second is harder. Only one is sustainable. 

 

References

1. NHS England – Integrated Performance Report, December 2025 
2. NHS England – Medium-Term Planning Framework and Productivity Expectations 
3. The King’s Fund – Productivity, capacity and value in the NHS 
4. Nuffield Trust – Flow, discharge and system efficiency 
5. Health Service Journal – Capacity, winter pressure and delivery risk