Of the five tests that make up the full Driver Certificate of Professional Competence, part 4 - the practical demonstration - is the one candidates most often underestimate. There is no driving to speak of: the examiner watches you do the job around the vehicle rather than in it. The government’s test guidance sets out the structure precisely, and candidates who study that structure pass; those who wing it discover that “at least 15 out of 20 in every topic” is a sterner hurdle than it sounds.
Part 4 is the end of the pipeline. You must have passed the Driver CPC part 2 case studies test before you can book it. Booking can go through your trainer or directly, with one exception: drivers requalifying by taking parts 2 and 4 cannot book online and must book by phone. The practicalities matter because they are enforced without sympathy: you must bring an HGV, bus or coach that meets the rules, plus specified identification - a Great Britain photocard licence, a Northern Ireland photocard with its paper counterpart, an EU photocard with counterpart where held, or a paper licence with a valid passport. Turn up without them and the test is cancelled and the fee is lost.
The test is built from five topics drawn from the Driver CPC syllabus, and each maps directly onto a duty a professional driver performs in real operations. Loading the vehicle following safety rules and keeping the load secure - the load security discipline that DVSA enforces at the roadside. Stopping trafficking in illegal immigrants - the vehicle security checks that international operators train as a matter of routine, from pre-departure walkarounds to knowing what to do when evidence of an intrusion is found. Assessing emergency situations - the judgement calls around breakdowns, incidents and hazards. Reducing physical risks to yourself or others - manual handling awareness and safe working around the vehicle. And the walkaround vehicle safety check - the daily defect routine every driver must perform before taking a vehicle out.
The scoring is the part that catches people. Each topic is worth up to 20 points, for a maximum of 100 - but the pass mark is not simply 80 overall. The candidate must score at least 15 out of 20 in each individual topic area and at least 80 out of 100 in total. A strong performance on four topics cannot rescue a 14 on the fifth. That structure demands balanced preparation: the candidate who polishes walkaround checks to perfection but cannot talk through load security or the illegal immigrant check will fail with a high-looking score.
The examiner tells you the result at the end of the test. A pass completes the practical side of the initial CPC. A fail is not a long delay - another test can be booked straight away - but it cannot be taken for another 3 clear working days, and each retake costs another fee and another vehicle hire. If DVSA cancels the test at short notice, there is a route to claim a refund of out-of-pocket expenses.
The candidates who pass first time treat part 4 as a demonstration of professional habits, not a memory test. Practise the walkaround check out loud, in order, on a real vehicle, naming components and defects until the sequence is automatic - because the examiner is scoring a demonstration, not a description. Learn the load security principles against the actual load types your training vehicle carries, and rehearse the illegal immigrant vehicle check as a physical routine with the reasoning behind each step. Use the topic list as a checklist in the final week: five topics, five passes required, no weak links. And for employers running trainees through the CPC, part 4 doubles as a template for yard training - the five topics are, almost word for word, the competencies a new driver’s first month on the fleet should be building.
It is worth pausing on why the five topics were chosen, because they are not arbitrary exam material. Load security failures, illegal immigrant incidents, roadside emergencies, manual handling injuries and missed defects are the five ways a professional driver most often ends up in an incident report. The test is DVSA’s way of checking that a newly qualified driver can demonstrate the countermeasures before encountering the real thing. Candidates should therefore prepare by doing, not reading: walk the vehicle check until the sequence is automatic, physically run the security check on a trailer, and practise talking through an emergency scenario with a trainer playing examiner. Scoring at least 15 out of 20 in every topic is a bar that rewards breadth - the demonstration rewards drivers who are genuinely ready for the yard, not just the test centre.