mhuxt, Dave Wallace on this board implied that 617 Squadron might have had Oboe in Post No. 28 here;
http://forum.12oclockhigh.net/showthread.php?p=90002
"617 Squadron Lancasters that carried tallboys could not be equipped with H2S. I have correspondence from Harris, Cochrane, Bennett, Saundby and others discussing this and also equipping Lancasters with Oboe, which also could not be fitted on a Lancaster with H2S.
While Oboe equipped aircraft could drop bombs or target indicators with the same accuracy in any type of cloud (the Oboe crews never used any visual references on a bombing run), the main force aircraft bombing the Oboe TIs were greatly affected by cloud. Sky marking was much less accurrate than groundmarking and the winter season Oboe attacks were on the whole less successful due to the weather. "
This makes sense. To achieve accurate aiming of large bombs, 617 Squadron would need to bomb with Oboe rather than bomb the markers dropped by Oboe Mosquitos.
Tony