The examiner who administered the examinations has a responsibility to hold copies of all the results for a 3 year period. Regardless of what happened to the school, it is the examiner who you should contact. It is unlikely that the CAA will have them as there is no official process of dealing with such records. If you don't know who the approved examiner was, the CAA will have details of the custodian of examination papers as part of the registration.
The CAA has numerous computer systems, the result of ill conceived and underfunded projects over a number of years, so they have little ability to keep or maintain coherent records from examiners or anyone else outside the building.
Whilst all of these things could be done by computer, the infrastructure is not there and there is no funding to pay for it.