Iron Knight was a BHP vessel en route to Newcastle when she was torpedoed on 8 February 1943.
ABC Radio RN programme 'Earshot' recently told the story of Iron Knight and other merchant ship casualties. Captain Iain Steverson, Branch Master, Newcastle was a major contributor.
The links are below.
"A merchant seaman's tale of survival from the sinking of the Iron Knight"
"Dad's Navy - the untold Story of the Merchant Navy in WW2"
NOTE: the full programme can be listened to by clicking on 'Listen' on the righthand side.