Very Sir Niall Dementia this applies to the police or CAA. They are not your friends and your arse could be on the line. It is also a good idea to simulate the interview before hand with informed friends and go through expected question and obtain any missing information before hand. Then you will have no surprises, can be in control of the meeting and have a straight story in your favour. Trying to think on your feet in a very stressful situation is asking for a disaster. In a past flying group had two similar situations and it ensured the AAIB and CAA received the correct message although the AAIB missed many of the engineer points as to why things went wrong and did not make the correct diagnoses.