Grey fleet: what you must check when staff use their own cars

Grey fleet means any vehicle used for work that the business does not own or lease. Someone's own car, driven to a client, a site or a supplier. It is the most common fleet in Britain and the least managed.

Or skip the working-out. The Beige Fleet & Driver Compliance Tracker has a grey fleet section built in, so employee-owned cars sit alongside your vans. The rest of this page is the detail.

Why it is your problem, not just theirs

The duty of care under the Health and Safety at Work Act 1974 follows the work, not the ownership of the vehicle. If someone drives for you, you are expected to take reasonable steps to make sure they are legal and the vehicle is roadworthy. Ownership does not transfer that duty to the employee, and "it was their own car" is not a defence anyone wants to test.

It is easy to miss precisely because nothing announces itself. Nobody sends you an invoice for a grey fleet vehicle. It just quietly starts being used.

The three things to check

• Their driving licence. Valid, correct categories, and any points. Check at least twice a year, the same as everyone else. See how often to check drivers' licences.
• Their MOT. A car over three years old needs a valid MOT, and you are relying on a vehicle you never see. Record the expiry date.
• Their insurance, and specifically business use. This is the one that bites.

Business use is the trap

A standard personal motor policy usually covers social, domestic and pleasure, plus commuting. It does not automatically cover driving for work. If an employee drives to a customer on their normal policy, they may be uninsured for that journey, which means an uninsured driver on your business, with the £300 fixed penalty, 6 points and seizure powers that come with it.

Business use is normally a cheap addition, sometimes free, but it has to be actively added. Ask for evidence rather than assurance, and record the renewal date so you can ask again next year.

A workable minimum

You do not need a policy document to manage this. What you need is a list of who drives their own car for work, and three dates against each name: licence check due, MOT expiry, insurance renewal. Ask once a year, record what you saw, and diarise the next ask.

The point is not paperwork for its own sake. It is being able to answer the question "how did you know they were legal to drive?" with something other than a shrug.

For the whole picture, see our fleet compliance deadlines guide, or let the Beige Fleet & Driver Compliance Tracker keep the dates for you.

Last reviewed: July 2026. General information, not legal advice.