[M sIMPSON]

Hi there,
The short version is that Cook and Mouchet were posted in to 12 Sqn to replace the original pilot and navigator of the other crewmen in your photograph. 122507 Michael Lloyd was posted in to 12 Sqn with his crew 15/7/43 from 1656 C.U. After flying a second pilot sortie 24-25/7/43, Lloyd took his own crew on 14 sorties, with one or two occasional crew changes. One the night of 22-23/10/43, he and his navigator, 1396342 (later 161242) Geoffrey Edward Parkes, took a new crew on a sortie to Kassel from which they failed to return.Cook and Mouchet were posted in to crew up with the remainder of the Lloyd crew. Posting in dates for Cook and Mouchet are a little unclear, but it seems that both had been at 166 Sqn.
The two members of the crew not identified in the post above are 1536325 William John Harold Edwards DFM 6/6/44 and 1580579 Alfred James Baker DFM 6/6/44.
The former members of the Lloyd crew completed their tours in early March 1944, and Cook was recrewed with a newly posted in A/G and W/Op and three members of another 12 Sqn crew that had been broken up in February 1944. Hope this is of interest.
Regards, Mark.