In reply to Finn of Bristol:
Oops, quite right, got my Olympic and Oceanic mixed up, sorry. It was the Oceanic that went down off Foula (https://en.wikipedia.org/wiki/RMS_Oceanic_(1899)) - a predecessor to the Olympic/Titanic class.
Can't remember who told me the story, may have been Andy Long (?), or one of the crew on the pelagic trawlers when discussing Shetland weather - it's mentioned in the Wikipedia article on the wreck though, so not just my memory playing up!