"Just culture"doesn't mean prosecution if you make a mistake, it means a proper investigation should be made and no blame attached unless deliberate violations are proven to have taken place. I have made mistakes and had reports raised against me. The interview procedure was to find out why I had made that mistake and try to stop it happening again. And Nutty, the CAA follow the EASA rule that if you certify work, it is done in accordance with specific maintenance documentation. Certainly is the policy of my companies engineering management, they never condon pick and choosing the way of doing tasks outside the manuals instructions. I have grounded aircraft because I do not have the right bolt and the company have always never put pressure on me to use illegal alternates.