The anti-British sentiment in Ireland ensured that there was plenty of speculation about "shoot downs" or "accidental collisions" . If something like this occured the most likely culprit would have been a wayward Jindivik drone from Llanbedr. However, this has never been substantiated in any way whatsoever - altough many Irish woul;d have said that this was just perfidious Albion up to her old tricks.
Some wreckage was recovered but not enough for any conclusions to be drawn. The investigation would have been under the Irish governments Department of Transport which would have had nothing like the expertise available to the British CAA.
I still go with ny uncle's theory.