XR362, Thank you Sir ,mystery solved it was RN269,confirmed by Chas Bowyer's Sunderland Book.Although I am sure it was "P" as the previous month ,I was flying "M" all month and that was ML745. Every time aircraft came up the slip for Minor/Major,they were swapped between 88/205/209 and the hull letter changed.
Thank you also India 42. added to my ever growing memorabilia file.