Well bearing in mind Pprune is a rumour network, the word on the street down here in Cornwall is that the Hawk was brought down by a birdstrike into the aircraft/engine and the culprit was a sea-gull.
Seems the most likely culprit bearing in mind the flocks of them around our coastline and really its surprising there aren't more problems with them.
No more detail to this rumour that was passed on to me by an old school mate who is a retired CPO ( ex Culdrose ), so we will see how good his source of information was in due course.