For many commercial vehicle technicians, the IRTEC theory test is the first formal examination they have sat in years. Some have not been in that situation since their apprenticeship. Assessment centres regularly see experienced technicians who know their way around an HGV inside out but who find the structured test environment unexpectedly daunting.
The good news is that with the right preparation, the IRTEC Underpinning Knowledge (UPK) test is very manageable. There is also one aspect of the test that surprises a significant number of candidates when they find out, and knowing it in advance will change how you prepare.
This guide is for technicians preparing to sit the UPK at Inspection Technician level, and for workshop managers and employers supporting their team through the process.
The UPK stands for Underpinning Knowledge. It is the theory component of the IRTEC accreditation process, conducted online at an IMI-approved assessment centre before you progress to the practical assessment.
At Inspection Technician level, the UPK consists of 40 multiple-choice questions covering the legislation and technical knowledge required to carry out commercial vehicle safety inspections to the recognised standard. To pass, you need to score 70% or above, which means answering at least 28 of the 40 questions correctly.
Once you have passed, you have 12 months to complete the practical assessment. This window is firm: if it closes without the practical being completed, you will need to retake the UPK and restart the process. It is worth scheduling your practical assessment early, rather than leaving it to the back end of that window. At Lloyd Morgan Group we provide the theory followed by practical over a day and a half avoiding the hassle of booking the practical later.
Here is the fact that trips up a significant number of candidates: the IRTEC Inspection Technician UPK is open-book.
During the test, you are permitted to access both the DVSA HGV (or PSV) Inspection Manual and the Guide to Maintaining Roadworthiness. These are the two primary documents that govern how commercial vehicles are inspected and maintained in line with operator licence requirements.
This does not mean the test is straightforward to walk into unprepared. The open-book format is not a shortcut; it reflects how the job actually works. In practice, inspecting technicians use these documents constantly. The test is assessing whether you understand how to apply them, not whether you have memorised them word for word.
The practical implication for preparation is this: you need to know these documents well enough to navigate them quickly under test conditions. A candidate who has never opened the HGV Inspection Manual before assessment day will find themselves hunting for answers rather than confirming them. A candidate who knows the structure, the sections, and the terminology will move through the test with confidence – which is why the assessment is bolted onto the end of our inspection course
The 40 questions span nine topic areas:
The licensing and enforcement section deserves particular attention. Technicians who have spent their careers in the workshop sometimes underestimate this area, because it draws on knowledge of operator licence obligations and the regulatory framework around commercial vehicle roadworthiness rather than on hands-on mechanical skill. The Guide to Maintaining Roadworthiness is your primary reference here, and it is worth spending time understanding what it requires of operators and technicians alike.
Work through the DVSA HGV Inspection Manual and the Guide to Maintaining Roadworthiness section by section, focusing on the areas that map to the nine topic areas above. Pay close attention to defect categories, inspection criteria, and the specific language used to define serviceability standards. That language will appear in test questions.
Because both manuals are available during the test, your speed and familiarity with their structure is a practical advantage. Before assessment day, spend time with the index, practise finding sections and figures quickly, and make sure you know which manual covers what. Time spent searching for an answer you are not sure where to look for is time that could cost you on other questions.
Many candidates arrive well-prepared on the mechanical content (brakes, tyres, steering) because they work with these systems every day. The licensing and enforcement questions can be less familiar, particularly for technicians who have not had regular exposure to operator compliance. Build in proportionally more revision time here.
Several questions will require you to apply specific figures: brake performance values, tyre tread depth requirements, lighting standards. These are the details that require either solid recall or the ability to locate them quickly in the documentation. Make sure you know where to find them.
If these are available to you, use them. Getting a feel for how questions are framed is genuinely useful, and it reduces the chance of being caught out by the format on the day.
“The open-book format catches a lot of people out because they assume it makes the test easy. It does not. What it does is reward technicians who genuinely understand the inspection standards and know where to find specific guidance quickly. If you are sitting down with the manual for the first time on assessment day, you are already behind. The candidates who pass comfortably are the ones who have worked through the documentation beforehand and know the structure well enough to navigate it under a bit of pressure.”
Andy Rae, Compliance Engineer, Lloyd Morgan Group
The test is conducted online at an IMI-approved assessment centre. Bring valid photo ID. The multiple-choice format means that even where you are uncertain, you can work through the options methodically using the reference materials beside you.
Nerves are completely normal, particularly if it has been a long time since you last sat a formal test. The consistent advice from experienced assessors is to take a breath, trust the experience you have built up in the workshop, and work through questions one at a time. The knowledge is there. The UPK is testing whether you can apply it in a structured way, not whether you can perform under pressure for its own sake.
For more on what happens once the theory is behind you, see our guide to [what to expect on IRTEC assessment day], and our article covering the [most common reasons technicians fail the IRTEC assessment] and how to avoid them.
Lloyd Morgan Group is one of the largest IRTEC delivery centres in the UK, providing assessments at our centres across the UK and on-site at employer premises across the country.
If you are preparing to sit the UPK or want to discuss what the assessment involves, speak to our team or visit the IRTEC Inspection Technician course page.
Thinking about progressing to the next level? Visit our IRTEC Advanced Technician course page for details on what that pathway involves.
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Find us at:
Lloyd Morgan Group Ltd
Phoenix House,
Hemlock Park,
Hyssop Close,
Cannock.
WS11 7GA
