Grey Fleet Policy: What UK Employers Must Include to Cover Vehicle, Driver and Journey Risk

What is a grey fleet policy?

Writing a grey fleet policy is the easy part. The hard part is proving every employee driving their own car for work has a valid licence, a current MOT and business use insurance, every time.

A grey fleet policy is a written set of rules covering any vehicle used for work that your business does not own, hire or lease, most commonly an employee’s own car. This is common: a 2025 industry mobility study found 75% of UK employees use their own vehicle for business travel. Reading Borough Council, for example, runs a published policy built on the same structure covered below.

What follows is what your policy must cover, the paperwork that makes it checkable, and why writing it down is only half the job. See our guide to grey fleet management for the wider picture.

Is a grey fleet policy legally required in the UK?

Yes. The Health and Safety Executive confirms the law applies to company and grey fleet vehicles in the same way, so there is no lighter obligation because an employee is driving their own car. The Royal Society for the Prevention of Accidents agrees: employers owe the same duty of care to staff driving their own vehicles as to company car drivers, and failing to verify a grey fleet vehicle is roadworthy and legal can carry its own penalties.

This is not one regulator’s reading of a grey area. Pinsent Masons, one of the UK’s largest law firms, confirms HSE guidance clarifies where responsibility sits. Insurance broker Marsh puts it plainly: employers must manage grey fleet with the same care as an owned fleet, and consistency is the hard part, not the drafting.

The three areas every grey fleet policy must cover: vehicle, driver, and journey

Every credible grey fleet policy is built around three things: the vehicle, the driver, and the journey. This is not a marketing framework, it is how real organisations structure live policies: Reading Borough Council’s own grey fleet policy uses exactly this breakdown.

Each pillar needs a specific, checkable rule rather than a vague instruction. The Association of Fleet Professionals confirms licences must be checked at the same intervals as any other work driver, not once at hiring and forgotten.

Getting this right puts you ahead of most UK employers. Trade press reporting found 62% of companies have no grey fleet policy at all, and only 16% have anything comprehensive. Even where a policy exists, how well it is actually checked varies hugely, which the vehicle section below covers in detail.

Vehicle requirements

Vehicle requirements cannot rely on an employee’s word. DVLA data shows more than 140,000 UK licence holders are currently banned from driving, and a banned driver in their own car on a work journey is still the employer’s liability. State plainly what you expect: a current MOT, business use cover rather than social, domestic and pleasure insurance only, and proof of tax and roadworthiness.

This is where policies quietly fail even on paper. A majority of UK employers do not fully check grey fleet vehicle roadworthiness or MOT currency, a gap serious enough that a national UK logistics trade association has launched a formal compliance service to help close it. Writing the requirement down is easy; checking it, every time, is where the exposure sits. See our guide on reducing fleet insurance costs with tracking and dash cams.

Driver requirements

Driver requirements start with verification, not trust. The DVLA’s position, cited by trade association Logistics UK, is that employers must confirm drivers are correctly licensed and entitled to drive, not assume it.

This cannot be a one-off hiring check. The Association of Fleet Professionals is clear that grey fleet drivers need licences checked at the same intervals as any other work driver, because a clean licence at onboarding does not stay clean. A meaningful share of business drivers carry live penalty points at any time, which a single onboarding check would never catch. Name a specific re-check interval in the policy rather than leaving it open; many employers choose to re-check annually as a practical baseline.

Journey requirements

Journey rules are not an optional extra bolted onto vehicle and driver checks. The Health and Safety Executive names the journey itself, alongside the driver and the vehicle, as one of the three core areas every work-driving risk assessment must cover, so routes, timing and passenger rules carry the same weight as MOT and licence requirements.

TyreSafe’s guidance on grey fleet risk covers journey failures under the same penalty framework as vehicle and driver failures, not as a lesser concern. Grey fleet journeys run into billions of business miles a year across the UK, which is why rules such as no non-work passengers during business use and realistic limits on driving hours matter beyond any single driver.

Supporting documents your policy needs

A policy only becomes real once backed by paperwork someone has to sign. Driving for Better Business, the road safety programme funded by National Highways, recommends two documents: a signed declaration confirming each driver has read and understood the policy, and a tick-box on every mileage claim confirming a valid MOT and road tax.

This is not unusual: Reading Borough Council and Chippenham Town Council both run live policies built around signed declarations and mileage-claim certification. Your documents should cover five things: a driver declaration form, a vehicle check sheet, a mileage claim form with the MOT and tax tick-box, a journey risk assessment, and confirmation the driver holds a licence valid for the vehicle type used.

The enforcement problem: why most grey fleet policies fail in practice

Here is the uncomfortable part: even employers who complete everything above routinely fail at the last step. A 2025 survey found only 22% of employees were even given a written driving-for-work policy, a lower bar than being asked to sign and follow one. The same research found 49% were never asked about a licence check, 31% were not asked for a valid MOT, and 35% were not asked for insurance evidence.

An earlier wave of TTC Group research, reported by Fleet News, found a related but distinct problem: only a third of organisations regularly verify MOT, insurance and tax on an ongoing basis, with most checking once at onboarding and never again. Having a policy and running it are two different achievements, and most employers only manage the first.

The cost is not just legal exposure. UK businesses lose an average of 9.1 working days per affected employee each year to grey fleet disruptions, according to the SIXT UK Mobility Study 2025. These numbers point to the same gap: the weakness sits in enforcement, not in drafting.

How grey fleet tracking turns policy into proof

Every requirement in your policy, a valid licence, a current MOT, business use insurance, can either sit on trust or be checked. Continuous digital verification moves it from the first to the second, replacing a yearly reminder email with something you can act on.

Traknova’s grey fleet tracking reads data already built into many vehicles from 2016 onwards, so in many cases there is no hardware to fit and no installation visit, which matters for employee-owned vehicles specifically, where asking staff to accept a fitted box is often the first objection raised.

What changes is specific. MOT status, tax records, service dates and mileage stop being a yearly chase and become something you can verify directly, whenever an auditor or insurer asks. Monitoring employee-owned vehicles also has data protection implications worth addressing in the policy itself, covering what data is collected, how it is used, and that employees are told upfront. That combination, verified checks plus a transparent approach to the data behind them, is the proof a written policy alone cannot provide.

Frequently asked questions

Is a grey fleet policy legally required in the UK? Yes. The Health and Safety Executive confirms the law applies equally to company and grey fleet vehicles, so an employee driving their own car for work carries the same duty of care obligation as one driving a company vehicle.

What should a grey fleet policy include? Three areas: vehicle (MOT, business use insurance, roadworthiness), driver (valid licence, checked at set intervals), and journey (routes, passengers, hours), backed by a signed driver declaration, a vehicle check sheet, a mileage claim form with an MOT and tax tick-box, and a journey risk assessment.

What happens if we don’t comply? UK employers can be prosecuted under four separate pieces of legislation: the Health and Safety at Work Act 1974, the Management of Health and Safety at Work Regulations 1999, the Health and Safety Offences Act 2008, and the Road Traffic Act 1988.

Does our existing business insurance cover grey fleet use? Not automatically. Employees using personal vehicles for work need business use cover, not just social, domestic and pleasure insurance, and employers should verify this directly rather than assume.

A written grey fleet policy, built around vehicle, driver and journey requirements and backed by signed paperwork, is what the law expects and good practice looks like. It is also, on its own, unprovable. The organisations genuinely protected can show, continuously, that the policy is being followed, not just that it was written.

See what continuous grey fleet verification looks like for your fleet. Traknova’s grey fleet solution gives you the MOT, tax, mileage and service-date visibility your policy requires, without a compliance department to chase it.