Most people choose a driving instructor the same way they choose a takeaway: whoever is closest, cheapest, and recommended by someone they know. For a takeaway, that's fine. For the person who will determine how many hours you spend in a car, at roughly £38 an hour, and who has a material influence on whether you pass or fail — it's worth thinking harder.
The good news is that there is one objective measure available to you that most learners don't think to ask about: ADI grade. Everything else requires judgement. This one has a number attached.
What ADI actually means
ADI stands for Approved Driving Instructor. In the UK, it is illegal to charge money for driving lessons unless you are a registered ADI or a trainee working under a pink trainee licence. To become an ADI, an instructor must pass three DVSA qualifying tests: a theory and hazard perception test, a practical driving test (to a higher standard than the standard learner test), and an instructional ability test.
The instructional ability test is the one that matters — it assesses how well the candidate can actually teach someone to drive, not just drive themselves. Passing all three puts the instructor on the ADI register and grants them the right to display a green hexagonal badge in the windscreen of any car they're using for lessons. That badge is the minimum verification you should do before getting in the car.
Every four years, registered ADIs undergo a standards check — a DVSA examiner rides along during a real lesson and assesses the instructional quality against a set of competencies. The result is a grade:
- Grade A: Met all or nearly all of the competencies assessed. This is the higher grade.
- Grade B: Met most competencies but with identified areas for improvement.
An instructor who received Grade A at their most recent standards check has been externally assessed as delivering high-quality instruction. That's a meaningful data point. Not a guarantee — a Grade B instructor might suit you better personally — but it's the closest thing to verified quality in this market.
You can ask any instructor what grade they received at their most recent check. The response tells you something: a confident instructor answers directly. One who deflects, claims not to remember, or says it "doesn't reflect real teaching quality" is giving you information, just not the kind they intend to.
How to verify registration
The green hexagonal badge in the windscreen is the first check. No badge, no lesson — taking money without being registered is a criminal offence, and your insurance may be void if the instructor isn't legitimate.
You can verify further at gov.uk/find-driving-instructor. Search by postcode and you'll see all registered ADIs in the area. The register shows their licence number, grade, and whether their registration is current. It takes two minutes and removes any ambiguity.
PDIs — trainee instructors
A PDI (Potential Driving Instructor) has passed at least the first two ADI qualifying tests and is working through the third under a pink trainee licence. They display a pink triangular badge rather than the green hexagon, and they are typically supervised by a registered ADI who takes responsibility for their training.
PDIs often offer lessons at reduced rates — sometimes significantly so — and lessons with them can be perfectly good value, particularly for straightforward learners. The tradeoff is that a PDI is still developing their diagnostic skills. They can teach you to do things correctly; they may be less effective at identifying subtly wrong habits and correcting them before the test. For a learner who is finding the process straightforward, a PDI is a reasonable choice. For a learner who is struggling in a specific area, the experienced ADI is the better investment.
The questions worth asking before you book
"What grade did you get at your last standards check?" — You already know this one.
"Do you teach to the DVSA National Standard?" — The DVSA publishes a structured national driver training standard that defines the competencies learners should develop and the order in which they're typically introduced. Instructors who work to this systematically are less likely to have you test-ready in some areas while unprepared in others. An instructor who isn't familiar with the national standard is worth questioning further.
"What is your cancellation policy?" — Most require 24–48 hours notice for cancellations. Some charge the full lesson fee for late cancellations. This matters over the course of 40–60 lessons — life happens, you will need to cancel occasionally, and the financial terms should be clear before you start.
"What car do you teach in?" — Make, model, and whether manual or automatic. The car matters more than learners expect — a smaller car is more forgiving on narrow roads, a larger car changes the parking exercise entirely. If the instructor's car is significantly different from what you'll actually drive once you pass, that's worth knowing.
"Can I try one lesson before committing?" — Most reputable instructors will agree to this. Anyone who requires you to commit to a block of 10+ lessons before you've tried one is optimising for their revenue rather than your outcome.
The factor nobody talks about enough
How you get on with your instructor as a person matters more than any metric. You are spending 40–60 hours in a car, under stress, learning something new, making mistakes repeatedly, and being corrected throughout. If the instructor's feedback style makes you more anxious rather than less — if their explanations don't land for you, if the dynamic in the car is tense — the number of hours you need will increase. Significantly.
A Grade A instructor who makes you nervous is worse for your outcome than a Grade B instructor you can relax with. The research on learning under stress is clear: cortisol impairs the retention of procedural skills. Anxious learners take longer to learn to drive. An instructor who understands this and actively manages the psychological environment of lessons will get you to test standard faster than one who is technically excellent but inadvertently stressful.
This is also why it is completely reasonable — expected, even — to change instructors if it's not working after 8–10 lessons. There is no loyalty obligation, no contract, no penalty. If you're not building confidence and getting specific actionable feedback after ten hours, try someone else. The cost of a few wasted lessons is much lower than the cost of 30 additional lessons with the wrong instructor.
Pass rate claims — how to read them
Every driving instructor claims to have an exceptional pass rate. "90%+ pass rates" appears in so many bios that it's effectively meaningless. DVSA does not publish individual instructor pass rates — that data is not available to the public — so any figure an instructor quotes is self-reported, unverified, and potentially based on whatever calculation makes them look best.
The right response to a pass rate claim is to note it and ask a follow-up: "How many tests did your students take last year?" An instructor who tested 5 students and 4 passed has a quoted pass rate of 80% — which is excellent in absolute terms, and also a sample size of 5. An instructor who tested 60 students is giving you a meaningful data point. The ratio only tells you something useful when the volume is high enough to be statistically credible.
Also see: How Many Lessons Does It Take to Pass? | Most Common Driving Test Fails | Driving Lessons Hub