Meadowbank
<<1. Aldergrove ATC was not fitted with SSR in June 94 and as such the aircraft would not have been allocated a Mode 3 IFF Squawk.
2. As there was no SSR in place, there is also no way of telling whether he was using a self allocated squawk such as 7000.
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Hopefully then the operator who was interviewed witnessed the radar somewhere else - only time will tell - sorry about the delay.
(Intuitively, it would seem to be unlikely that ZD576 could have been followed up to impact at its level by primary radar from Aldergrove anyway.)