Hugh
I thought the story of the five two-seaters was familiar.
The story is recounted in "Fighter Pilot" by "McScotch" (William Maclanachan). *I'm sorry I don't know when he published the book.
The five pilots involved were 'Zulu' Lloyd,
Mick Mannock, Kennedy, Tudhope and Maclanachan. *It appears the event took place in July or August 1917.