Wellingtons from 38 squadron attacked a small convoy described as 1 MV (4-5000 tons) and 2 DRs at 33 38N, 23 28E on 7/8 October. They attacked the MV. Flares were first dropped by what was called the "Special Wellington" and Sgt Buchanan (Wellington HD966) then dropped two torpedoes one at 0036 and the second at 0052. At 0140 another plane dropped two torpedoes but the pilot believed the torpedoes missed astern.
The ship could not be located in daylight and Sgt Buchanan was credited with the ship.
From the description of the attack, it is clear the Wellingtons were first sent individually to a specific location (33 30N, 23 00E) and if they had no Special Wellington reports by then, they were to start their own (visual) search for the convoy. They had apparently reached that location and started their own searches when they received reports of the convoy's actual location and could soon see the flares.
The full description of the attack can be downloaded (currently for free) starting here:
https://www.nationalarchives.gov.uk/...oks-1939-1945/
Scroll down toward the bottom of the page and enter "38" for the squadron* and 1942 for the starting and ending years.
You want to find and download the "October 1942" "Records of Events" file.
Comparing the description from the national archives with the description you posted reveals a lot of similarities. It does appear that the British times and the Italian times may differ by 1 hour. Eight planes each carrying two torpedoes were sent out by 38 Sqn but only two of the planes appear to have actually attacked.
I believe the "Special" Wellington(s?) which located the convoy via radar and dropped the flares were from 221 Squadron. Their records seem to show a successful search and flare drops that evening in the location of the convoy by two different search planes, HX513 flown by F/O Gay and HX381 flown by F/Sgt Sayers.
Also interesting when looking at the records is that the 38 Sqn Wellingtons had a crew of 5 while the "Special" Wellingtons from 221 had a crew of 6. I would assume the extra man was the radar operator.
There is an account of a different Wellington attack here, along with mention of the role of a "Special Wellington".
http://www.warfaremagazine.co.uk/articles/DAF/268