The tester will tell you to show your lights, indicators, wipers, hazard lights etc. he will then test the emissions of your vehicle and headlight alignment. This is follwed by a seatbelt check and a quick look under the bonnet.
From here you drive forward over an inspection pit where the steering will be checked. You remain in your vehicle through the test. You drive onto a small rolling road where the brakes are tested. Your handbrake is then tested.
The computer will record braking pressure etc. When completed you drive out of the other end of the lane and await your pass/fail certificate.
If you pass your ITV you will be given a sticker to display in your windscreen for the next 12 months. If you fail you will be given a fail notice which gives you two months to make the repair then re-book the test. The re-test is free if made within the two month period.
Article written from our own experience, September 2010