There might be a tragic story building here.
The pinger as reported in the press is just off Blackrock Light (BBC News).
The traces of AIS flight path as shown on line show a circle of Blackrock.
The Last AIS position recorded at 00:46 was N54.06736º, W10.3229º, which is just next to Blackrock, in the surf.
The wreckage as reported by fisbangwollop, has been found is just off the island (60 meters). This is unconfirmed by any news source.
Blackrock is located atop a 300 foot cliff, Blacksod is just about at sea level.