It's taken me a while, but now I have found the CFV site I can add that my late father was Sub Lt Ron Woods, who served on ML 903 throughout her service. I have models of the motor launch as built by my father, both in her original form (which I believe only lasted for 10 days or so) and after she was rebuilt with a radar tower, along with another 5 MLs. The height and weight of the tower made her pitch and roll somewhat, but as I understand it, meant that she was able to adopt a tactical role among other ships not so fitted. I had the impression that this was particularly important at Walcheren, but suspect it was similarly so on D-Day.
When she was decommissioned in 1946, my father rescued the ship's bell, and I was able to have it rung at the Centenary of the Armistice last year, on the front of a locomotive that had been built for use in the trenches. It may have been an odd role for 903's bell, but it helped make a link between the two world wars.
Tim Woods (Rev'd)