If the vehicle fails its MOT, it does not meet legal requirements and must be repaired to comply with MOT Test standards. The notes on the back of the report your Nominated Tester gives you will help you.
If you think the Nominated Tester has been unfair you can appeal against the decision. Ask for a VT17 form that explains what to do.
Click here for details on how you can claim a re-test free of charge.