4 If you are interviewed in person, note that the CAA interviewer will be a former police-officer and NOT an aviation expert. His skills will be confined to interpreting the law and interview procedures.. he/she will most likely have no flying experience or qualifications.
Really? I wouldn't bank on it. I'd expect him to be expert in aviation law and interview procedures whether he was and ex pilot or ex CID and have been given plenty of opportunity to gain flying experience.
And I would't try and talk to witnesses outside a court either.
Carrying a GPS was a good tip. What about a recorder as used for gliding.
Good luck.