SS,
Looking at the BBC video at about 0:25 onwards, it looked to me as if the propeller blade in the 7 o'clock position (as viewed from the nose) was damaged and delaminated at the tip. It seems to be fluttering in the wind.
The video's a bit grainy so it's not entirely clear.
BBC NEWS | England | Coventry/Warwickshire | Death gyrocopter 'followed hunt'