According to this site D7S Telnes was sunk by a German submarine on January 19, 1940 NW of the Orkney Islands, the entire crew was lost. Two things about this confuses me:

1/ Why can't this vessel be found in Lloyd's War Losses vol 1 & II?

2/ How do we know the date and approximate position of loss if there were no survivors. Did this information come from the crew of the German submarine which was lost some days later?

Regards Jan-Olof