The seat was retained by his son , Phelim O'Neill , who was unopposed as the Unionist candidate .
It was held due to the resignation of the incumbent Ulster Unionist MP , Sir Hugh O'Neill .
The seat was retained by Hugh O'Neill 's son , Phelim O'Neill , who was unopposed as Ulster Unionist Unionist candidate .
It was held due to the resignation of the incumbent Ulster Unionist MP , Sir Hugh O'Neill .