Thanks for that! I went through all the Bristow Helicopters photos on ABPic, but must have missed that one. Does anyone know if that external tank was a permanent fixture? That would help narrow it down to a Widgeon without that tank. My grainy picture shows the round exhaust just aft of the (open) sliding door within the blue cheatline, which would in my view have been covered if that tank had been fitted.
Did Bristow operate other Widgeons apart from these two?