The investigation identified the following causal factors:
1. The pilot allowed the aircraft to descend below the minimum altitude for the aircraft’s position on the approach procedure, and this descent probably continued unchecked until the aircraft flew into the sea.
2. A combination of fatigue, workload and lack of recent flying practise probably contributed to the pilot’s reduced performance.
3. The pilot may have been subject to an undetermined influence such as disorientation, distraction or a subtle incapacitation, which affected his ability to safely control the aircraft’s flightpath.
AAIB Report here;
http://www.aaib.dft.gov.uk/sites/aai...06__g_bomg.cfm