Hello
From "The Bomber Command War Diaries" by Martin Middlebrook & Chris Everitt, there's a raid against Essen during the night 11/12, so I don't think it matches.
There'a another raid against Essen during the night 12/13, involving 4 Pathfinder Mosquitos et 55 Lancasters and No. 1 and 5 Groups. 1 Lancaster lost. Minor operations : 32 aircraft minelaying off Biscay ports , 5 O.T.U. sorties. No losses.
So your grand-father's first op, while still in O.T.U., in one of these 5. Usually the O.T.U. ops were leaflets dropping, missions known as "nickel" or "nickelling". If you have the O.T.U. number (you should, as you have the log-book), you should be able to check the relevant Operations Record Book, at The National Archives, in Kew, London.
HTH
Joss
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