One of the piece of documentation I'd like to see is the Casualty Report and MRES additions for ED559. I found this article about how the MRES unit of the RAF operated and how it worked both during and after the Second World War.
The Ministry of Defence first released their casualty reports in 2013, with casualties from 1939 (there are approximately 20,500 files to be released, each file for a single aircraft). They are currently releasing the documents in date order so there may be a short wait until the records for 1943 are released.
The files at the National Archive are available here in AIR 81.