Student records are the resposability of the Head of training or whatever they call the post now. Even if they go bust they can't just dump them all in a skip.
I don't think they are the property of the student because all FTO's have to keep them for 5 years after you have completed the course. Even if you transfer to another school the orginal school keep thier originals and provide copys to the new school.
The caa will be interested if for no other reason to get the exam papers back.
Don't waste your time running around trying to speak to people who don't want to talk to you. They have no choice but to speak to the CAA unless they don't want to hold a post again and potentially loose thier exam approvals.