The loss information of S/L Mulfords Wellington I quoted is from"Bomber Command Losses 1943",sorry It was not fully accurate. Whether it applied to your father's aircraft I do not know,but many aircraft shot down over Holland crashed in The Zieder Zee, an area of Holland allowed to be flooded by the sea during the occupation,many were subsequently recovered after the War.My own father survived his first tour with 50 Sqd and then, even more fortunatly a second tour on Stirlings with 15 Sqd in 1943.Wishing you well in the search for information,amazing that the sons of two men who flew together 68 years a go find themselves able to contact each other!