The amount of learners on here that have a "I did this and failed, but my friend did it too and passed" or "My ------ did that and failed for it" blah blah blah. The fact of the matter is, the examiner is far more experience than you. If you fail, you deserved to fail. No amount of "Oh but I'm a great driver, the EXAMINER was wrong." If they have cause to believe that you put the vehicle or anybody else's vehicle in a dangerous situation, you fail. Simple as. Don't get all high and mighty because you've had 20 driving lessons.