Roughly 199 million days of paid statutory leave went uncollected by UK workers last year, according to research commissioned by private diagnostics provider Vista Health and published in summer 2026. The survey of 2,003 UK adults, conducted between 31 July and 5 August, found the average worker ended their most recent full leave year carrying seven unused days. Mapped against the 30.3 million payrolled employees counted by the Office for National Statistics (ONS), that figure is not a rounding error: it represents a structural failure to deliver on entitlements that Parliament has anchored in statute.

The reasons workers gave for leaving leave on the table point squarely at resourcing, not preference. Some 23% said they had simply been too busy at work to take it; 18% said no cover was available; and 14% feared the workload would pile up in their absence. Taken together, those responses describe a workforce that is, in practice, being denied a right it holds in law, not because the leave was refused, but because the conditions necessary to use it do not exist.

What the numbers actually say

The Vista Health research goes further than forfeited holidays. Nearly half of all workers surveyed, 49%, said they had continued working while feeling unwell during the summer months, doing so for an average of six days each. The reasons tracked the leave findings closely: 28% cited excessive workload, 17% said no one could cover them, and 16% feared the backlog that would greet them on return.

The productivity consequences of that presenteeism are documented in the same data. Some 28% of those who worked while unwell reported becoming less productive; 25% said they struggled to concentrate; and 24% felt worse by the end of the working day. The Health and Safety Executive (HSE) has long identified presenteeism as a compounding factor in workplace ill-health, and this data reinforces that position: working through illness does not shorten the recovery period, it extends it, often at a measurable cost to output quality.

Healthcare access is the third casualty. Some 29% of respondents had postponed a medical appointment, test or check during the summer, with the average delay running to six weeks. Of those, 35% attributed it to being too busy with work, 15% could not secure a convenient appointment slot, and 14% had no one to cover them. Half of all respondents said they were worried about entering autumn already fatigued, with 27% flagging low energy and 24% naming sleep difficulties or burnout as the specific concern.

The geography of unused leave

The Vista Health data carries a regional dimension that is worth examining in its own right. Truro recorded the highest average unused leave at 7.8 days per worker, followed by Newcastle upon Tyne at 7.5 days. London was joint third alongside Cambridge and Belfast, with an average of 7.2 days per worker. Applied to the capital's estimated 4.3 million payrolled employees, that single figure produces a rough estimate of around 31 million days of unused paid holiday per year in London alone.

The spread across cities of different sizes and economic profiles challenges the assumption that this is a City-of-London or financial-sector problem. Truro and Newcastle are not dominated by high-intensity finance roles. The common thread is teams running with insufficient cover, a pattern that cuts across sectors and geographies wherever headcount is lean relative to operational demand.

The statutory frame: Working Time Regulations 1998

The legal baseline matters here. Under the Working Time Regulations 1998, workers in Great Britain are entitled to a minimum of 5.6 weeks of paid annual leave per year (regulation 13 and regulation 13A), with the right to take that leave at a time agreed with the employer. The regulations do not simply grant leave on paper: they impose an obligation on employers to ensure workers can actually take it. ACAS (Advisory, Conciliation and Arbitration Service) guidance on annual leave reinforces this, specifying that employers should actively facilitate leave use rather than treat requests as a matter of passive approval.

Where a documented pattern emerges of employees unable to take their entitlement because of understaffing, the exposure under the Working Time Regulations becomes material. A worker who carries unused statutory leave because cover was never arranged can, in principle, bring a claim before an employment tribunal. The Chartered Institute of Personnel and Development (CIPD), whose annual Reward Management Survey tracks leave policy across UK organisations, has consistently noted that low leave utilisation rates at team level are a leading indicator of resourcing stress, not of worker contentment.

The Employment Rights Act 1996 (ERA 1996) adds a further layer: under section 27A, workers have the right not to suffer detriment as a result of exercising a statutory right, which includes the right to annual leave. An employee who faces implicit or explicit pressure not to take leave is in territory that ACAS advises employers to take seriously, particularly where the pressure is systemic rather than situational.

The medical view

Dr Reem Hasan, Chief Medical Officer at Vista Health and an NHS GP, placed the findings in a seasonal context that many workers will recognise.

"Summer is often associated with rest and relaxation, but for many people it brings a very different reality. School holidays, juggling childcare, caring responsibilities, travel, financial pressures and covering for colleagues can all make it harder to prioritise our own health and wellbeing."

Dr Hasan was equally direct on what functional workplaces need to deliver.

"Healthy workplaces should make it possible for people to take appropriate time to recover, attend healthcare appointments and use their annual leave without feeling that they are letting colleagues down."

And on the connection between workforce health and business performance:

"Supporting health and wellbeing is not separate from organisational performance; the two are closely connected."

That framing aligns with the direction of CIPD's most recent research on employee wellbeing, which found that organisations where managers actively schedule leave tend to report lower rates of long-term sickness absence. The Trades Union Congress (TUC) has separately raised the erosion of statutory rest in practice as a concern across low-margin sectors, particularly retail, hospitality and logistics, where cover shortfalls are most acute.

For employees: what to do with days still on the clock

If you are heading into the autumn quarter carrying unused leave, the first practical step is to obtain your employer's carry-over policy in writing. Under the Working Time Regulations 1998 (regulation 13), most workers cannot automatically carry their full 5.6 weeks into the next leave year unless the employer's policy or a relevant agreement permits it. The exception introduced during the Covid-19 pandemic allowed carry-over where leave could not be taken for reasons outside the worker's control, and while the original emergency provisions have since expired, tribunals have looked closely at situations where structural understaffing prevented leave from being taken.

A few approaches that tend to shift things in practice:

• Book remaining leave in confirmed calendar blocks now. Waiting for a quieter period that will make the timing feel less disruptive is a common trap; workload rarely self-regulates around individual diaries.
• If unavailability of cover is the recurring obstacle, raise it in writing to your line manager and, if necessary, to HR. That converts an unspoken cultural pressure into a documented resourcing question, which is a different kind of conversation.
• Treat medical appointments as fixed commitments rather than provisional entries that can be moved. The Vista Health data shows that a six-week delay on a routine check-up is the norm once work pressure takes hold; that interval is long enough for minor conditions to become more significant ones.
• If a role consistently makes taking statutory leave feel operationally impossible, that is a signal worth taking seriously. Verified employee reviews from people already in that role tend to surface the pattern before you experience it firsthand.

For HR and employers: the exposure you are carrying

The Vista Health numbers describe a workforce whose practical ability to rest is constrained by staffing levels, not by personal choice. From an HR and legal-risk perspective, that creates exposure on at least three fronts that reward committees and people teams should examine before year-end.

Legal exposure under the Working Time Regulations 1998. ACAS is clear that employers bear an active responsibility to facilitate annual leave, not merely to process requests. A documented pattern, visible in team-level leave utilisation data, of employees who cannot take their entitlement because cover is never available, sits uncomfortably close to a systemic failure to comply with regulation 13. Employment tribunals have found against employers in analogous cases where the structural conditions for leave were never established. The CIPD advises HR teams to treat leave utilisation rates as a compliance metric, not solely a wellbeing one.

Presenteeism as a hidden cost. The survey data shows that approximately half the workforce is working through illness for an average of six days at a stretch, and that roughly a quarter of them report degraded concentration as a result. That output is paid for at full cost while delivering reduced value. It does not appear in absence trackers, which means it rarely surfaces in standard management reporting. HSE research on work-related stress and ill-health consistently identifies presenteeism as a cost-amplifier: the worker who attends while unwell takes longer to recover and is more likely to have a prolonged subsequent absence.

Retention signal in disguise. Workers who find that their statutory entitlements cannot be exercised in practice tend not to cite leave in exit interviews. They name burnout, exhaustion, or feeling unsupported by management. Those are the same resourcing failure described in different language. For HR teams using employee review data and internal pulse surveys to monitor retention risk, low leave utilisation at team level is one of the cleaner leading indicators available.

What actually shifts the pattern

Audit leave utilisation at team level rather than by organisational average. Company-wide figures mask the two or three teams where no one is taking leave, which is precisely where legal and wellbeing risk concentrates. Cover architecture needs to be built into the organisational structure rather than left to individual heroics: cross-training, documented handover protocols, and a named backup for each operationally critical function transform the response to leave requests from a cultural negotiation into a solvable logistical question.

Managers are the pivot point. A wellbeing statement in an employee handbook does not outweigh the influence of a line manager who responds to leave requests with visible reluctance. CIPD's research on line manager capability indicates that actively scheduling leave with direct reports at the start of the leave year, and tracking team-level utilisation as part of regular one-to-ones, produces measurably higher take-up than policy alone. Holding managers to team utilisation targets, rather than leaving leave management as an informal norm, is the operational step that turns policy intent into practice.

The bigger picture

199 million forfeited days is a large aggregate, but the underlying unit of measurement is a single moment: a worker looks at their calendar, concludes they cannot be spared, and quietly cancels the week they had planned. Repeated across 30.3 million payrolled employees, that private calculation becomes a national pattern of statutory rest going uncollected. The downstream cost, in slower recovery, delayed NHS appointments and autumn burnout across the workforce, has not been fully quantified, but the directional signal from this data is clear enough to act on now.

For employees, the entitlement is yours under the Working Time Regulations 1998, and the practical steps to protect it are worth taking this quarter. For HR and people teams, the pattern visible in this data is a resourcing signal that is considerably cheaper to address proactively than to manage through elevated sickness absence, tribunal risk or the exit of experienced staff. The ONS payroll data and the CIPD's own benchmarking surveys provide the UK-grounded reference points for any organisation that wants to know how its leave utilisation compares to sector norms. Start there.