headsethair,
from the AAIB report page 2:
"The pilots would not provide details of the amount of fuel carried on board but reported that it was sufficient for the crossing. Their flight plan specified an endurance of 7 hours 30 minutes. An unmodified R44 fitted with an auxiliary fuel tank, carrying its maximum capacity of 185 litres of usable fuel would have given an endurance of just over 3 hours."
this sounds quite factual
regards
CF