I believe the attack was carried out by seven Wellingtons from 38 Squadron on the night of February 2/3. Two failed to return (one Wellington was seen to crash into the water near the scene of the attack and the other apparently attempted to fly to Turkey.) (An eighth Wellington had an early return and never took part in the attack.)
You can download for free the 38 Squadron records of the attack from here once you create a sign-on.
https://discovery.nationalarchives.g...ils/r/D8411369
The records describe a somewhat confused situation as the visibility was not good. They describe an attack on a large MV (estimated to be 3000-4000 GRT) escorted by what they claim was 4 (not 3) smaller escort ships. Flak was heavy. After the MV was set on fire by bombs they could see the flames from 25 miles away.
It would be interesting if we could find a detailed description from the German side to compare the narrations in particular to compare the times given for the attack and the exact location. The attack was also observed by the Dutch submarine Dolfijn but I can't find any detailed description from that point of view either.