MAY I POINT OUT THAT, IF YOU DO GET A TRANSPONDER CODE FROM THAT SOURCE, THE INFORMATION WOULD BE A MEMORY OF A FLEETING INCIDENT THAT HAPPENED SOME FOUR THOUSAND DAYS AGO INVOLVING AN AIRCRAFT THAT WAS NOT UNDER THE CONTROL OF WHICHEVER ATC UNIT THAT PERSON WAS INVOLVED WITH - IF,INDEED,THEY WERE INVOLVED.
In the interests of fairness, radar recordings from the Prestwick ATC Centre will have been held and stored, SOP for any fatal accident, so any data would not be a fleeting memory but presumably can be checked on replay.
Now, whether the authorities will do so is another matter. The tapes are the property of NATS which is run as a private company, perhaps not covered by the Freedom of Information Act ?