[Ludovico Slongo]

I'm looking for information regarding Sergeant Ronald Slater a fighter pilot that flew with 33 Squadron during 1940.
In particular, I'm trying to understand if he was indeed shot down by Italian fighters during a combat over Bardia on July the 25th.
Many British historians gave this information, above all the GREAT Chris Shores in "Fighters over the Desert", but also Hugh Halliday in his well researched "Woody a fighter pilot's album", Andrew Thomas in Osprey's "Gloster Gladiator aces" and E.C.R. Baker in "The fighter aces of the RAF" (quoted by Michael Lavigne in "Hurricanes over the Sands vol. 1").
Moreover, Richard Townshend Bickers in "The Desert Air War" and Alex Crawford in his wonderful site about the Gladiator speak of a 33 Gladiator loss on the 25th of July without name of the pilot and Chaz Bowyer in "Men of the Desert Air Force 1940-43" suggests that Slater's Gladiator was at least seen spinning down during a scrap with CR 42s on the 25th.
The problem is that 33 Squadron ORB for the period (in its 540 and 541 forms) doesn't mention at all this loss and on the contrary suggests that Slater's plane came back and flew other missions on the following days.
Hope someone can help to clarify what happened in fact.
Thanks in advance.
Ludovico.