 During the second SRA-guided approach, the aircraft descended well below the glide slope and collided with an -high electricity transmission tower situated on the extended centreline of the runway approximately from the runway threshold.The collision caused severe damage to the left engine and to the structure of the left wing; the aircraft rolled to the left and dropped, clipping a house before crashing into an area of woodland and catching fire.The Air Accidents Investigation Branch (AAIB) determined that the accident was caused by the flight crew allowing the aircraft to descend significantly below the minimum descent height for the approach without gaining sight of the approach lighting or runway threshold.